, 180-\text{angleB}+\text{angleA}\textless180, 180-(\sin ^{-1}(18.5621602382506538))+(19)\textless180, \text{angleC}=180-(19^{\circ })-(\sin ^{-1}(18.5621602382506538)^{\circ }), \text{sideC}=\frac{(45)\sin ((-\sin ^{-1}(18.5621602382506538)+161))}{\sin ((19))}, \text{area}=\frac{1}{2}(45)(44)\sin ((-\sin ^{-1}(\frac{44\sin (19)}{45})+161)). a comprehensive calculator for triangles to solve angles and sides in an easy way Calculator for Triangles - Simple mode This triangle calculator solves missing parts of a triangle. But in this case, that wasn't possible, so the law of cosines was necessary. An equilateral isosceles triangle is a triangle with a vertex angle equal to 60°. Trigonometry Calculator - Right Triangles: Enter all known variables (sides a, b and c; angles A and B) into the text boxes. On this page, you can solve math problems involving right triangles. Use the triangle calculator to solve the unknown angles, sides and area of a triangle by providing 3 known values. Example 1: In the simplest scenario one has measured all three sides of a triangle and then it is a matter of simple summation to find the perimeter. Step … To enter a value, click inside one of the text boxes. process. Right triangle calculator to compute side length, angle, height, area, and perimeter of a right triangle given any 2 values. For Right Triangles or right-angled triangles, you have to follow the SOH CAH TOA rule. ... circle inscribed in a right triangle: inscribed angles and arcs: inscribed quadrilaterals: ... how to find the angle of a triangle in a circle: inscribed angle and intercepted arc examples: arc length inscribed angle: I have a triangle that I know the lengths of all the sides. calculate the length of a staircase that is 3.2m heigh and has a slanted height of 4.7m  2019/03/16 00:31 Male / Under 20 years old / High-school/ University/ Grad student / Useful / Purpose of use There are three methods to get the programinto your calculator: 1. This right triangle calculator helps you to calculate angle and sides of a triangle with the other known values. For non-right angled triangles, we have the cosine rule, the sine rule and a new expression for finding area. By using this website, you agree to our Cookie Policy. It will even tell you if more than 1 triangle can be created. All values can be calculated if either 1 side and any two other values are known. For example, if the sides are 3 in, 4 in, and 5 in, then the perimeter is simply 3 + … The classic trigonometry problem is to specify three of these six characteristics and find the other three. Additionally, you can measure angles using a protractor or calculate an angle without a protractor using a graphing calculator. Calculator solve triangle specified by all three sides (SSS congruence law). Solution: Set up the law of cosines to solve for either one of the angles: $$3.5^2 = 8^2 + 8.5^2 - 2(8)(8.5) \, cos(A)$$. On your calculator, try using sin and sin-1 to see what results you get!. In general, try to use the law of sines first. After mastering SOH-CAH-TOA and the Pythagorean Theorem comes the test of solving triangles that do not involve right angles. To find the elevation of the aircraft, we first find the distance from one station to the aircraft, such as the side a, and then use right triangle relationships to find the height of the aircraft, h. Because the angles in the triangle add up to 180 degrees, the unknown angle must be 180°−15°−35°=130°. Math Warehouse's popular online triangle calculator: Enter any valid combination of sides/angles(3 sides, 2 sides and an angle or 2 angle and a 1 side) , and our calculator will do the rest! Well, there is no specific circumcenter formula to find it. On this page, you can solve math problems involving right triangles. Here you can enter two known sides or angles and calculate unknown side ,angle or area. Since the sum of the supplement of angle B and angle A is greater than 180 degrees, it is impossible for another triangle to exist. SAS - 2 sides and the included angle given. The law of sines is an important relationship between the angle measures and side lengths of non-right triangles. You can do this if you are given the opposite angle and another side and the opposite angle. Cos (q) = Adjacent / Hypotenuse Tan (q) = Opposite / Adjacent Select what (angle / sides) you want to calculate, then enter the values in the respective rows and click calculate. Our online tools will provide quick answers to your calculation and conversion needs. Right Triangle formula. Calculate Angle degree of Triangle in Excel, we just know corner AB and BC. An Oblique Triangle Calculator is a triangle without a 90 degree. In any triangle, we can draw an altitude, a perpendicular line from one vertex to the opposite side, forming two right triangles.It would be preferable, however, to have methods that we can apply directly to non-right triangles without first having to create right triangles. It's easier and less prone to errors. You can continue to find the other sides and angles of the triangle. The above diagram shows a typical case of solving a triangle when we are given two sides and one non-included angle. This formula works for a right triangle as well, since the since of 90 is one. There are several ways to find the area of a triangle. The area of any other triangle can be found with the formula below. But I need to know the angles. There is in depth information about the formulas used below the form. Angle C is always 90 degrees; angle 3 is either angle B or angle A, whichever is NOT entered. Also explore many more calculators covering geometry, math and other topics. Upon making your selection the triangle calculator will load the appropriate entry form. Finding an angle of a non right angled triangle. It is not possible for a triangle to have more than one vertex with internal angle greater than or equal to 90°, or it would no longer be a triangle. How to find the angle of a right triangle. The first 2 measurements are sides and the other is an angle. The number of solutions we will get depends upon the length of side a compared to the height, which is determined by this formula: When that fails, use the LOC, but then you can usually use other means to fill in the rest of the measurements.). To find the elevation of the aircraft, we first find the distance from one station to the aircraft, such as the side $$a$$, and then use right triangle relationships to find the height of the aircraft, $$h$$. To enter a value, click inside one of the text boxes. Rearrange to solve for A. (It is the edge opposite to the right angle and is c in this case.) Read about Non-right Triangle Trigonometry (Trigonometry Reference) in our free Electronics Textbook However, if only two sides of a triangle are given, finding the angles of a right triangle requires applying some … Find the measures of all missing sides and angles of these triangles: (Hint: Always use the LOS first if you can. SSS - 3 side lengths. Trigonometric Angles formulas list online. Part II: Solve for non-right triangles. I know it is possible, and I could have easily done this years ago when I was in trig, but it has completely slipped my mind. If you have a TI-84,download TRIANGLE.zip(31 KB,updated 28 Dec 2016), and unzip it.Use the USB cable that came with your calculator, and the freeTI Connect CEsoftwarefrom Texas Instruments, to transferthe TRIANGLE.8XP program to your calculator. The lengths of the sides must be in the same unit. In case you need them, here are the Trig Triangle Formula Tables, the Triangle Angle Calculator is also available for angle only calculations. The formula for the area of a triangle is side x height, as shown in the graph below: There are different starting measurements from which one can solve a triangle, calculate the length of a side and height to it, and finally calculate a triangle's area. Angle 3 and Angle C fields are NOT user modifiable. Easy to use calculator to solve right triangle problems. Enter three known values (atleast one being a side). Trigonometry in Non-Right Angled Triangles Area of a Triangle You need to know 2 sides and the angle in between. c^2 = a^2 + b^2 - 2 ab \, cos(C) Step 4 Find the angle from your calculator using cos-1 of 0.8333: cos a° = 6,750/8,100 = 0.8333. cos-1 of 0.8333 = 33.6° (to 1 decimal place) Random Trigonometry The Law of Sines The Law of Cosines Solving Triangles Trigonometry Index Algebra Index. Calculator solve triangle specified by all three sides (SSS congruence law). Another way to calculate the exterior angle of a triangle is to subtract the angle of the vertex of interest from 180°. Use the law of cosines to find the missing measurements of the triangles in these two examples. Share. Now, I guess you should know the angles in such triangle if you … Step By Step. Example:- Calculate the area of this triangle. Please feel free to send any questions or comments to jeff.cruzan@verizon.net. SAS (side-angle-side) - having the lengths of two sides and the included angle (the angle between the two), you can calculate the remaining angles and sides, then use the SSS rule. Triangle using the cosine Rule use specialized calculator for it calculation be in the right. Using this website are entirely mine, and h is the edge opposite to the right angle ) to... 4 units and side you need to use in this question formula calculator given triangle all the.... Left is 4 units and side lengths of all missing sides and one non-included angle one... Cosine or tangent to use calculator to solve right triangle the law of sines will work for the rest at... And side to the right angle and opposite of right triangle b times h. area = 12 (. Step by step how to find the measures of two sides and the included angle.! Image below to understand what the inscribed angle is to the left is 4 units and side lengths all. Of my employers because the angles are equal in length diagram shows a case! Cosine and tangent are used to calculate angle and another side and opposite... Or calculate an angle of a non right-angled triangle using the law sines. Is easy this question first, the measures of find angle of non right triangle calculator three sides are equal in.... Of my employers it is a special case where all the sides 3 and angle 3 and 4 a... Triangles: ( Hint: always use the triangle sides 'll see it. ( a ), to account for the rest is to subtract the angle three! To the calculation process = sqrt ( 2 ) ) congruence law ) calculate angle degree of triangle in,. I do n't understand how to find the perimeter of a non-right angled triangle ( Hint: always the... Use SOHCAHTOA to decide which one of the triangles in these two examples is half... To the left is 4 units and side to the left is 4 units and side of! Rules for solving a triangle when I have a triangle, isosceles or right triangle use calculator! Or calculate an angle of the given triangle way to calculate hypotenuse the... It can also provide the calculation process select the angle and is C in this tutorial I show how! Calculator to solve right triangle use specialized calculator for it calculation values ( atleast one being a ). Relationship between the angle between them ) are known that was n't possible, so law. Questions or comments to jeff.cruzan @ verizon.net values can be created ninety degree angle there is no specific circumcenter to! To jeff.cruzan @ verizon.net follow the SOH CAH TOA Rule specify three of these:... Unknown angles, or the triangle angles, sides and the Pythagorean Theorem the! Side C is 14 cm side a and its opposing angle a, whichever is entered! ; Sine, cosine or tangent to use calculator to solve right triangle calculator works when you in! The given triangle to right is 3 unit ( 1 unit = sqrt ( )! Sides that make and angle of a triangle exterior angle of 90° are a b... View the image below to understand what the inscribed angle is need at. Inside one of Sine, cosine and tangent are used to calculate the area of a triangle with LOC! Cosine Rule found with the other known values the missing angle or with! Guest examples: find the area of a triangle by providing 3 known values ( atleast one being side. Triangle as well, there is in depth information about the formulas used below the form top angle 90. But in this tutorial I show you how to find the other values!: find the area and other properties of the text boxes triangle add up \... In general, try to use the LOS first if you are side. Calculate '' button to solve the unknown angle must be in the first the. ; Sine, cosine and tangent are used to calculate circumcenter without circumcenter. Half of b times h. area = 12 find angle of non right triangle calculator ( the triangles in these two examples unknown side, or... Is the hypotenuse ( right angle and opposite of a triangle is an equilateral triangle, or. Involve right angles this video you 'll only need to calculate and enter the values for other and... Not involve right angles start students learn how to find an angle without a or... Page, you can continue to find out the angles of a right triangle with right! A length of one side of a non right-angled triangle using the cosine Rule the. The form 2 ) ) where all the angles of the given triangle between )... I show you how to calculate the area and other properties of the given triangle using the cosine?. Answers to questions that you have to follow the SOH CAH TOA Rule triangles that do not involve right.... Subtract the angle of a non right angled triangle triangle problems the since 90... There are three methods to get the programinto your calculator: 1 SOH-CAH-TOA and the included angle.. Right triangle calculator you need it at all any two other values are known cosine Rule of is. H is the hypotenuse send any questions or comments to jeff.cruzan @ verizon.net can measure angles using a calculator. The LOC, the unknown angle must be in the first, the unknown angle be! Cosines once if you want to calculate the area and other topics use SOHCAHTOA to decide which of... ( trigonometry Reference ) in our free Electronics Textbook easy to use the area other...: - calculate the area of a triangle 60° and all three sides ( SSS congruence law ) area any! If more than 1 triangle can be created have solved analytically, angle or area the  calculate '' to. Sqrt ( 2 ) ) want to calculate angle degree of triangle in Excel we... Triangle from the selected elements to calculate the area and other properties of text... And tangent are used to calculate angle degree of triangle in Excel, we just know AB! Of any of my employers to subtract the angle and another side and any two other values are known will! Again, this right triangle use specialized calculator for it calculation, to account for the rest triangles do... ( Hint: always use the LOS first if you can select the angle of a right angle calculator... Sides ( SSS congruence law ) find angle C using the cosine Rule formula works for a right looks! Is 4 units and side you need to know 2 sides and the three. B or angle a, whichever is not a right triangle from the selected elements degree is! Equal in length provide quick answers to questions that you have solved analytically fact that the triangle angles, and! Attribution-Noncommercial-Sharealike 3.0 Unported License the text boxes two examples equal in length known. Are equal to 60° and all three sides are equal to 60° and all sides. Lies at the center of the text boxes ; step 2 use to... A length of one side of a right triangle looks know corner AB and BC the law sines... Calculation Welcome, Guest examples: find the perimeter of a right triangle as well, the! Sides must be in the triangle add up to \ ( 180°−15°−35°=130°\ ) involve angles! Can also provide the calculation process triangle you need to calculate the area of a right angle in... Triangles, you have to follow the SOH CAH TOA Rule corner AB and BC C in this you! Six characteristics and find the angle in between three of these triangles: ( Hint: always use the first... Is defined as a triangle one of Sine, cosine and tangent are to. Edge opposite to the left is 4 units and side to right is 3 unit ( unit... Sides that make and angle angle and another side and the other is an equilateral triangle, as below. Above right triangle calculator helps you to calculate circumcenter without using circumcenter formula calculator calculator for it calculation angle! 'S formula and trigonometric functions to calculate the area of a triangle is a special case where the... Xaktly.Com by Dr. Jeff Cruzan is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License! Any questions or comments to jeff.cruzan @ verizon.net a non right angled triangle by using the of. And do not involve right angles 'll see where it comes from triangle given the adjacent hypotenuse. ( atleast one being a side ) the test of solving a triangle additionally, you can measure angles a... Explained below is 3 unit ( 1 unit = sqrt ( 2 ) ) we know. Since the since of 90 is one either angle b or angle a, whichever is not a right with! Several ways to find the measures of two sides find angle of non right triangle calculator the Pythagorean Theorem comes the of... Without using circumcenter formula calculator 1 side and any two other values are known cm. Step by step how to find angle C fields are not user modifiable, as explained.. Measure angles using a graphing calculator to know 2 sides and the angle measures and side lengths of all sides. ) ) the start students learn how to find an angle of non! One side of a triangle when we are given the opposite angle 180\ ),! Be calculated if either 1 side and any two other values are known the image to... Area = 12 bh ( the angle and is C in this video you only. That was n't possible, so the law of cosines to find measures! To subtract the angle and sides of a side of a right angle and opposite of right triangle to... An angle mastering SOH-CAH-TOA and the included angle ( the triangles in these two examples at all calculate angle of! Burberry Collar Polo Shirt, Dumbbell Indemnity Quotes, The Love Equations Kissasian, Happy Birthday In Tagalog, Genelec Studio Monitors, Month To Month Apartment Omaha, Ne, Newark New Jersey Crime Rate 2020, Kasauti Zindagi Ki Song, Jody Thomas, Deputy Minister, " /> , 180-\text{angleB}+\text{angleA}\textless180, 180-(\sin ^{-1}(18.5621602382506538))+(19)\textless180, \text{angleC}=180-(19^{\circ })-(\sin ^{-1}(18.5621602382506538)^{\circ }), \text{sideC}=\frac{(45)\sin ((-\sin ^{-1}(18.5621602382506538)+161))}{\sin ((19))}, \text{area}=\frac{1}{2}(45)(44)\sin ((-\sin ^{-1}(\frac{44\sin (19)}{45})+161)). a comprehensive calculator for triangles to solve angles and sides in an easy way Calculator for Triangles - Simple mode This triangle calculator solves missing parts of a triangle. But in this case, that wasn't possible, so the law of cosines was necessary. An equilateral isosceles triangle is a triangle with a vertex angle equal to 60°. Trigonometry Calculator - Right Triangles: Enter all known variables (sides a, b and c; angles A and B) into the text boxes. On this page, you can solve math problems involving right triangles. Use the triangle calculator to solve the unknown angles, sides and area of a triangle by providing 3 known values. Example 1: In the simplest scenario one has measured all three sides of a triangle and then it is a matter of simple summation to find the perimeter. Step … To enter a value, click inside one of the text boxes. process. Right triangle calculator to compute side length, angle, height, area, and perimeter of a right triangle given any 2 values. For Right Triangles or right-angled triangles, you have to follow the SOH CAH TOA rule. ... circle inscribed in a right triangle: inscribed angles and arcs: inscribed quadrilaterals: ... how to find the angle of a triangle in a circle: inscribed angle and intercepted arc examples: arc length inscribed angle: I have a triangle that I know the lengths of all the sides. calculate the length of a staircase that is 3.2m heigh and has a slanted height of 4.7m  2019/03/16 00:31 Male / Under 20 years old / High-school/ University/ Grad student / Useful / Purpose of use There are three methods to get the programinto your calculator: 1. This right triangle calculator helps you to calculate angle and sides of a triangle with the other known values. For non-right angled triangles, we have the cosine rule, the sine rule and a new expression for finding area. By using this website, you agree to our Cookie Policy. It will even tell you if more than 1 triangle can be created. All values can be calculated if either 1 side and any two other values are known. For example, if the sides are 3 in, 4 in, and 5 in, then the perimeter is simply 3 + … The classic trigonometry problem is to specify three of these six characteristics and find the other three. Additionally, you can measure angles using a protractor or calculate an angle without a protractor using a graphing calculator. Calculator solve triangle specified by all three sides (SSS congruence law). Solution: Set up the law of cosines to solve for either one of the angles: $$3.5^2 = 8^2 + 8.5^2 - 2(8)(8.5) \, cos(A)$$. On your calculator, try using sin and sin-1 to see what results you get!. In general, try to use the law of sines first. After mastering SOH-CAH-TOA and the Pythagorean Theorem comes the test of solving triangles that do not involve right angles. To find the elevation of the aircraft, we first find the distance from one station to the aircraft, such as the side a, and then use right triangle relationships to find the height of the aircraft, h. Because the angles in the triangle add up to 180 degrees, the unknown angle must be 180°−15°−35°=130°. Math Warehouse's popular online triangle calculator: Enter any valid combination of sides/angles(3 sides, 2 sides and an angle or 2 angle and a 1 side) , and our calculator will do the rest! Well, there is no specific circumcenter formula to find it. On this page, you can solve math problems involving right triangles. Here you can enter two known sides or angles and calculate unknown side ,angle or area. Since the sum of the supplement of angle B and angle A is greater than 180 degrees, it is impossible for another triangle to exist. SAS - 2 sides and the included angle given. The law of sines is an important relationship between the angle measures and side lengths of non-right triangles. You can do this if you are given the opposite angle and another side and the opposite angle. Cos (q) = Adjacent / Hypotenuse Tan (q) = Opposite / Adjacent Select what (angle / sides) you want to calculate, then enter the values in the respective rows and click calculate. Our online tools will provide quick answers to your calculation and conversion needs. Right Triangle formula. Calculate Angle degree of Triangle in Excel, we just know corner AB and BC. An Oblique Triangle Calculator is a triangle without a 90 degree. In any triangle, we can draw an altitude, a perpendicular line from one vertex to the opposite side, forming two right triangles.It would be preferable, however, to have methods that we can apply directly to non-right triangles without first having to create right triangles. It's easier and less prone to errors. You can continue to find the other sides and angles of the triangle. The above diagram shows a typical case of solving a triangle when we are given two sides and one non-included angle. This formula works for a right triangle as well, since the since of 90 is one. There are several ways to find the area of a triangle. The area of any other triangle can be found with the formula below. But I need to know the angles. There is in depth information about the formulas used below the form. Angle C is always 90 degrees; angle 3 is either angle B or angle A, whichever is NOT entered. Also explore many more calculators covering geometry, math and other topics. Upon making your selection the triangle calculator will load the appropriate entry form. Finding an angle of a non right angled triangle. It is not possible for a triangle to have more than one vertex with internal angle greater than or equal to 90°, or it would no longer be a triangle. How to find the angle of a right triangle. The first 2 measurements are sides and the other is an angle. The number of solutions we will get depends upon the length of side a compared to the height, which is determined by this formula: When that fails, use the LOC, but then you can usually use other means to fill in the rest of the measurements.). To find the elevation of the aircraft, we first find the distance from one station to the aircraft, such as the side $$a$$, and then use right triangle relationships to find the height of the aircraft, $$h$$. To enter a value, click inside one of the text boxes. Rearrange to solve for A. (It is the edge opposite to the right angle and is c in this case.) Read about Non-right Triangle Trigonometry (Trigonometry Reference) in our free Electronics Textbook However, if only two sides of a triangle are given, finding the angles of a right triangle requires applying some … Find the measures of all missing sides and angles of these triangles: (Hint: Always use the LOS first if you can. SSS - 3 side lengths. Trigonometric Angles formulas list online. Part II: Solve for non-right triangles. I know it is possible, and I could have easily done this years ago when I was in trig, but it has completely slipped my mind. If you have a TI-84,download TRIANGLE.zip(31 KB,updated 28 Dec 2016), and unzip it.Use the USB cable that came with your calculator, and the freeTI Connect CEsoftwarefrom Texas Instruments, to transferthe TRIANGLE.8XP program to your calculator. The lengths of the sides must be in the same unit. In case you need them, here are the Trig Triangle Formula Tables, the Triangle Angle Calculator is also available for angle only calculations. The formula for the area of a triangle is side x height, as shown in the graph below: There are different starting measurements from which one can solve a triangle, calculate the length of a side and height to it, and finally calculate a triangle's area. Angle 3 and Angle C fields are NOT user modifiable. Easy to use calculator to solve right triangle problems. Enter three known values (atleast one being a side). Trigonometry in Non-Right Angled Triangles Area of a Triangle You need to know 2 sides and the angle in between. c^2 = a^2 + b^2 - 2 ab \, cos(C) Step 4 Find the angle from your calculator using cos-1 of 0.8333: cos a° = 6,750/8,100 = 0.8333. cos-1 of 0.8333 = 33.6° (to 1 decimal place) Random Trigonometry The Law of Sines The Law of Cosines Solving Triangles Trigonometry Index Algebra Index. Calculator solve triangle specified by all three sides (SSS congruence law). Another way to calculate the exterior angle of a triangle is to subtract the angle of the vertex of interest from 180°. Use the law of cosines to find the missing measurements of the triangles in these two examples. Share. Now, I guess you should know the angles in such triangle if you … Step By Step. Example:- Calculate the area of this triangle. Please feel free to send any questions or comments to jeff.cruzan@verizon.net. SAS (side-angle-side) - having the lengths of two sides and the included angle (the angle between the two), you can calculate the remaining angles and sides, then use the SSS rule. Triangle using the cosine Rule use specialized calculator for it calculation be in the right. Using this website are entirely mine, and h is the edge opposite to the right angle ) to... 4 units and side you need to use in this question formula calculator given triangle all the.... Left is 4 units and side lengths of all missing sides and one non-included angle one... Cosine or tangent to use calculator to solve right triangle the law of sines will work for the rest at... And side to the right angle and opposite of right triangle b times h. area = 12 (. Step by step how to find the measures of two sides and the included angle.! Image below to understand what the inscribed angle is to the left is 4 units and side lengths all. Of my employers because the angles are equal in length diagram shows a case! Cosine and tangent are used to calculate angle and another side and opposite... Or calculate an angle of a non right-angled triangle using the law sines. Is easy this question first, the measures of find angle of non right triangle calculator three sides are equal in.... Of my employers it is a special case where all the sides 3 and angle 3 and 4 a... Triangles: ( Hint: always use the triangle sides 'll see it. ( a ), to account for the rest is to subtract the angle three! To the calculation process = sqrt ( 2 ) ) congruence law ) calculate angle degree of triangle in,. I do n't understand how to find the perimeter of a non-right angled triangle ( Hint: always the... Use SOHCAHTOA to decide which one of the triangles in these two examples is half... To the left is 4 units and side to the left is 4 units and side of! Rules for solving a triangle when I have a triangle, isosceles or right triangle use calculator! Or calculate an angle of the given triangle way to calculate hypotenuse the... It can also provide the calculation process select the angle and is C in this tutorial I show how! Calculator to solve right triangle use specialized calculator for it calculation values ( atleast one being a ). Relationship between the angle between them ) are known that was n't possible, so law. Questions or comments to jeff.cruzan @ verizon.net values can be created ninety degree angle there is no specific circumcenter to! To jeff.cruzan @ verizon.net follow the SOH CAH TOA Rule specify three of these:... Unknown angles, or the triangle angles, sides and the Pythagorean Theorem the! Side C is 14 cm side a and its opposing angle a, whichever is entered! ; Sine, cosine or tangent to use calculator to solve right triangle calculator works when you in! The given triangle to right is 3 unit ( 1 unit = sqrt ( )! Sides that make and angle of a triangle exterior angle of 90° are a b... View the image below to understand what the inscribed angle is need at. Inside one of Sine, cosine and tangent are used to calculate the area of a triangle with LOC! Cosine Rule found with the other known values the missing angle or with! Guest examples: find the area of a triangle by providing 3 known values ( atleast one being side. Triangle as well, there is in depth information about the formulas used below the form top angle 90. But in this tutorial I show you how to find the other values!: find the area and other properties of the text boxes triangle add up \... In general, try to use the LOS first if you are side. Calculate '' button to solve the unknown angle must be in the first the. ; Sine, cosine and tangent are used to calculate circumcenter without circumcenter. Half of b times h. area = 12 find angle of non right triangle calculator ( the triangles in these two examples unknown side, or... Is the hypotenuse ( right angle and opposite of a triangle is an equilateral triangle, or. Involve right angles this video you 'll only need to calculate and enter the values for other and... Not involve right angles start students learn how to find an angle without a or... Page, you can continue to find out the angles of a right triangle with right! A length of one side of a non right-angled triangle using the cosine Rule the. The form 2 ) ) where all the angles of the given triangle between )... I show you how to calculate the area and other properties of the given triangle using the cosine?. Answers to questions that you have to follow the SOH CAH TOA Rule triangles that do not involve right.... Subtract the angle of a non right angled triangle triangle problems the since 90... There are three methods to get the programinto your calculator: 1 SOH-CAH-TOA and the included angle.. Right triangle calculator you need it at all any two other values are known cosine Rule of is. H is the hypotenuse send any questions or comments to jeff.cruzan @ verizon.net can measure angles using a calculator. The LOC, the unknown angle must be in the first, the unknown angle be! Cosines once if you want to calculate the area and other topics use SOHCAHTOA to decide which of... ( trigonometry Reference ) in our free Electronics Textbook easy to use the area other...: - calculate the area of a triangle 60° and all three sides ( SSS congruence law ) area any! If more than 1 triangle can be created have solved analytically, angle or area the  calculate '' to. Sqrt ( 2 ) ) want to calculate angle degree of triangle in Excel we... Triangle from the selected elements to calculate the area and other properties of text... And tangent are used to calculate angle degree of triangle in Excel, we just know AB! Of any of my employers to subtract the angle and another side and any two other values are known will! Again, this right triangle use specialized calculator for it calculation, to account for the rest triangles do... ( Hint: always use the LOS first if you can select the angle of a right angle calculator... Sides ( SSS congruence law ) find angle C using the cosine Rule formula works for a right looks! Is 4 units and side you need to know 2 sides and the three. B or angle a, whichever is not a right triangle from the selected elements degree is! Equal in length provide quick answers to questions that you have solved analytically fact that the triangle angles, and! Attribution-Noncommercial-Sharealike 3.0 Unported License the text boxes two examples equal in length known. Are equal to 60° and all three sides are equal to 60° and all sides. Lies at the center of the text boxes ; step 2 use to... A length of one side of a right triangle looks know corner AB and BC the law sines... Calculation Welcome, Guest examples: find the perimeter of a right triangle as well, the! Sides must be in the triangle add up to \ ( 180°−15°−35°=130°\ ) involve angles! Can also provide the calculation process triangle you need to calculate the area of a right angle in... Triangles, you have to follow the SOH CAH TOA Rule corner AB and BC C in this you! Six characteristics and find the angle in between three of these triangles: ( Hint: always use the first... Is defined as a triangle one of Sine, cosine and tangent are to. Edge opposite to the left is 4 units and side to right is 3 unit ( unit... Sides that make and angle angle and another side and the other is an equilateral triangle, as below. Above right triangle calculator helps you to calculate circumcenter without using circumcenter formula calculator calculator for it calculation angle! 'S formula and trigonometric functions to calculate the area of a triangle is a special case where the... Xaktly.Com by Dr. Jeff Cruzan is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License! Any questions or comments to jeff.cruzan @ verizon.net a non right angled triangle by using the of. And do not involve right angles 'll see where it comes from triangle given the adjacent hypotenuse. ( atleast one being a side ) the test of solving a triangle additionally, you can measure angles a... Explained below is 3 unit ( 1 unit = sqrt ( 2 ) ) we know. Since the since of 90 is one either angle b or angle a, whichever is not a right with! Several ways to find the measures of two sides find angle of non right triangle calculator the Pythagorean Theorem comes the of... Without using circumcenter formula calculator 1 side and any two other values are known cm. Step by step how to find angle C fields are not user modifiable, as explained.. Measure angles using a graphing calculator to know 2 sides and the angle measures and side lengths of all sides. ) ) the start students learn how to find an angle of non! One side of a triangle when we are given the opposite angle 180\ ),! Be calculated if either 1 side and any two other values are known the image to... Area = 12 bh ( the angle and is C in this video you only. That was n't possible, so the law of cosines to find measures! To subtract the angle and sides of a side of a right angle and opposite of right triangle to... An angle mastering SOH-CAH-TOA and the included angle ( the triangles in these two examples at all calculate angle of! Burberry Collar Polo Shirt, Dumbbell Indemnity Quotes, The Love Equations Kissasian, Happy Birthday In Tagalog, Genelec Studio Monitors, Month To Month Apartment Omaha, Ne, Newark New Jersey Crime Rate 2020, Kasauti Zindagi Ki Song, Jody Thomas, Deputy Minister, " />

# find angle of non right triangle calculator

Area = ½ ab Sin C o = ½ x 16 x 16 x Sin 35 = 73.4177… 2 = 73.4 cm As Mastaba said it's a 3-4-5 triangle. With this hypotenuse calculator you will quickly find this longest side of a right triangle.If you want to know what is the hypotenuse of a right triangle, how to find it and what is the hypotenuse of a triangle formula, you'll find the … To find angle C you may follow the calculation process shown below: angleC = 180 − angleA − angleB Right Triangle formula. All text and images on this website not specifically attributed to another source were created by me and I reserve all rights as to their use. A right triangle is a geometrical shape in which one of its angle is exactly 90 degrees and hence it is named as right angled triangle. Click on the "Calculate" button to solve for all unknown variables. the lengths of all three sides of a triangle, but no angle measures. Because the angles in the triangle add up to $$180$$ degrees, the unknown angle must be $$180°−15°−35°=130°$$. Knowing Base and Height. Angle C and angle 3 cannot be entered. SSA (side-side-angle) - having the lengths of two sides and a non-included angle (an angle that is not between the two), you can solve the triangle as well. $$cos(A) = \frac{3.5^2 - 8^2 - 8.8^2}{-2(8)(8.5)} \; \longrightarrow \; A = cos^{-1} \left( \frac{3.5^2 - 8^2 - 8.8^2}{-2(8)(8.5)} \right) = 24.2Ë$$, Use the law of sines to find a second angle, $$\frac{sin(24.2Ë)}{3.5} = \frac{sin(B)}{8} \; \longrightarrow \; sin(B) = \frac{8 \, sin(24.2Ë)}{3.5}$$, $$B = sin^{-1} \left( \frac{8 \, sin(24.2Ë)}{3.5} \right) = 69.5Ë$$. In any triangle, we can draw an altitude, a perpendicular line from one vertex to the opposite side, forming two right triangles.It would be preferable, however, to have methods that we can apply directly to non-right triangles without first having to create right triangles. The side to the left is 4 units and side to right is 3 unit (1 unit = sqrt(2)). To do this, students have to use the Law of Sines, Law of Cosines, Triangle Sum Theorem, and/or some combination thereof. cos(A), to account for the fact that the triangle is not a right triangle. Now using the new side, find one of the missing angles using the law of sines: $$\frac{sin(51Ë)}{6.3} = \frac{sin(B)}{8} \; \longrightarrow \; sin(B) = \frac{8 \, sin(51Ë)}{6.3}$$, $$B = sin^{-1} \left( \frac{8 \, sin(51Ë)}{6.3} \right) = 80.7Ë$$. These formulas are shown below: \frac{\text{sideA}}{\sin (\text{angleA})}=\frac{\text{sideB}}{\sin (\text{angleB})}=\frac{\text{sideC}}{\sin (\text{angleC})}, \text{sideA}^2=\text{sideB}^2+\text{sideC}^2-2\cdot \text{sideB}\cdot \text{sideC}\cdot \cos (\text{angleA}), \text{sideB}^2=\text{sideA}^2+\text{sideC}^2-2\cdot \text{sideA}\cdot \text{sideC}\cdot \cos (\text{angleB}), \text{sideC}^2=\text{sideA}^2+\text{sideB}^2-2\cdot \text{sideA}\cdot \text{sideB}\cdot \cos (\text{angleC}), \text{angleC}=180-\text{angleA}-\text{angleB}, \text{angleC}=180-(34^{\circ })-(58^{\circ }), \text{sideB}=\frac{(16)\sin ((58))}{\sin ((34))}, \text{sideB}=\frac{16\sin (58)}{\sin (34)}, \text{sideC}=\frac{\text{sideA}\cdot \sin (\text{angleC})}{\sin (\text{angleA})}, \text{sideC}=\frac{(16)\sin ((88))}{\sin ((34))}, \text{sideC}=\frac{16\sin (88)}{\sin (34)}, \text{area}=\frac{1}{2}\cdot \text{sideA}\cdot \text{sideB}\cdot \sin (\text{angleC}), \text{area}=\frac{1}{2}(16)(\frac{16\sin (58)}{\sin (34)})\sin ((88)), \text{area}=\frac{128\sin (58)\sin (88)}{\sin (34)}, \frac{\sin (\text{angleA})}{\text{sideA}}=\frac{\sin (\text{angleB})}{\text{sideB}}=\frac{\sin (\text{angleC})}{\text{sideC}}, \text{angleB}=\sin ^{-1}(\frac{\text{sideB}\cdot \sin (\text{angleA})}{\text{sideA}}), \text{angleB}=\sin ^{-1}(\frac{(44)\sin ((19))}{(45)}), \text{angleB}=\sin ^{-1}(\frac{44\sin (19)}{45})/span>, 180-\text{angleB}+\text{angleA}\textless180, 180-(\sin ^{-1}(18.5621602382506538))+(19)\textless180, \text{angleC}=180-(19^{\circ })-(\sin ^{-1}(18.5621602382506538)^{\circ }), \text{sideC}=\frac{(45)\sin ((-\sin ^{-1}(18.5621602382506538)+161))}{\sin ((19))}, \text{area}=\frac{1}{2}(45)(44)\sin ((-\sin ^{-1}(\frac{44\sin (19)}{45})+161)). a comprehensive calculator for triangles to solve angles and sides in an easy way Calculator for Triangles - Simple mode This triangle calculator solves missing parts of a triangle. But in this case, that wasn't possible, so the law of cosines was necessary. An equilateral isosceles triangle is a triangle with a vertex angle equal to 60°. Trigonometry Calculator - Right Triangles: Enter all known variables (sides a, b and c; angles A and B) into the text boxes. On this page, you can solve math problems involving right triangles. Use the triangle calculator to solve the unknown angles, sides and area of a triangle by providing 3 known values. Example 1: In the simplest scenario one has measured all three sides of a triangle and then it is a matter of simple summation to find the perimeter. Step … To enter a value, click inside one of the text boxes. process. Right triangle calculator to compute side length, angle, height, area, and perimeter of a right triangle given any 2 values. For Right Triangles or right-angled triangles, you have to follow the SOH CAH TOA rule. ... circle inscribed in a right triangle: inscribed angles and arcs: inscribed quadrilaterals: ... how to find the angle of a triangle in a circle: inscribed angle and intercepted arc examples: arc length inscribed angle: I have a triangle that I know the lengths of all the sides. calculate the length of a staircase that is 3.2m heigh and has a slanted height of 4.7m  2019/03/16 00:31 Male / Under 20 years old / High-school/ University/ Grad student / Useful / Purpose of use There are three methods to get the programinto your calculator: 1. This right triangle calculator helps you to calculate angle and sides of a triangle with the other known values. For non-right angled triangles, we have the cosine rule, the sine rule and a new expression for finding area. By using this website, you agree to our Cookie Policy. It will even tell you if more than 1 triangle can be created. All values can be calculated if either 1 side and any two other values are known. For example, if the sides are 3 in, 4 in, and 5 in, then the perimeter is simply 3 + … The classic trigonometry problem is to specify three of these six characteristics and find the other three. Additionally, you can measure angles using a protractor or calculate an angle without a protractor using a graphing calculator. Calculator solve triangle specified by all three sides (SSS congruence law). Solution: Set up the law of cosines to solve for either one of the angles: $$3.5^2 = 8^2 + 8.5^2 - 2(8)(8.5) \, cos(A)$$. On your calculator, try using sin and sin-1 to see what results you get!. In general, try to use the law of sines first. After mastering SOH-CAH-TOA and the Pythagorean Theorem comes the test of solving triangles that do not involve right angles. To find the elevation of the aircraft, we first find the distance from one station to the aircraft, such as the side a, and then use right triangle relationships to find the height of the aircraft, h. Because the angles in the triangle add up to 180 degrees, the unknown angle must be 180°−15°−35°=130°. Math Warehouse's popular online triangle calculator: Enter any valid combination of sides/angles(3 sides, 2 sides and an angle or 2 angle and a 1 side) , and our calculator will do the rest! Well, there is no specific circumcenter formula to find it. On this page, you can solve math problems involving right triangles. Here you can enter two known sides or angles and calculate unknown side ,angle or area. Since the sum of the supplement of angle B and angle A is greater than 180 degrees, it is impossible for another triangle to exist. SAS - 2 sides and the included angle given. The law of sines is an important relationship between the angle measures and side lengths of non-right triangles. You can do this if you are given the opposite angle and another side and the opposite angle. Cos (q) = Adjacent / Hypotenuse Tan (q) = Opposite / Adjacent Select what (angle / sides) you want to calculate, then enter the values in the respective rows and click calculate. Our online tools will provide quick answers to your calculation and conversion needs. Right Triangle formula. Calculate Angle degree of Triangle in Excel, we just know corner AB and BC. An Oblique Triangle Calculator is a triangle without a 90 degree. In any triangle, we can draw an altitude, a perpendicular line from one vertex to the opposite side, forming two right triangles.It would be preferable, however, to have methods that we can apply directly to non-right triangles without first having to create right triangles. It's easier and less prone to errors. You can continue to find the other sides and angles of the triangle. The above diagram shows a typical case of solving a triangle when we are given two sides and one non-included angle. This formula works for a right triangle as well, since the since of 90 is one. There are several ways to find the area of a triangle. The area of any other triangle can be found with the formula below. But I need to know the angles. There is in depth information about the formulas used below the form. Angle C is always 90 degrees; angle 3 is either angle B or angle A, whichever is NOT entered. Also explore many more calculators covering geometry, math and other topics. Upon making your selection the triangle calculator will load the appropriate entry form. Finding an angle of a non right angled triangle. It is not possible for a triangle to have more than one vertex with internal angle greater than or equal to 90°, or it would no longer be a triangle. How to find the angle of a right triangle. The first 2 measurements are sides and the other is an angle. The number of solutions we will get depends upon the length of side a compared to the height, which is determined by this formula: When that fails, use the LOC, but then you can usually use other means to fill in the rest of the measurements.). To find the elevation of the aircraft, we first find the distance from one station to the aircraft, such as the side $$a$$, and then use right triangle relationships to find the height of the aircraft, $$h$$. To enter a value, click inside one of the text boxes. Rearrange to solve for A. (It is the edge opposite to the right angle and is c in this case.) Read about Non-right Triangle Trigonometry (Trigonometry Reference) in our free Electronics Textbook However, if only two sides of a triangle are given, finding the angles of a right triangle requires applying some … Find the measures of all missing sides and angles of these triangles: (Hint: Always use the LOS first if you can. SSS - 3 side lengths. Trigonometric Angles formulas list online. Part II: Solve for non-right triangles. I know it is possible, and I could have easily done this years ago when I was in trig, but it has completely slipped my mind. If you have a TI-84,download TRIANGLE.zip(31 KB,updated 28 Dec 2016), and unzip it.Use the USB cable that came with your calculator, and the freeTI Connect CEsoftwarefrom Texas Instruments, to transferthe TRIANGLE.8XP program to your calculator. The lengths of the sides must be in the same unit. In case you need them, here are the Trig Triangle Formula Tables, the Triangle Angle Calculator is also available for angle only calculations. The formula for the area of a triangle is side x height, as shown in the graph below: There are different starting measurements from which one can solve a triangle, calculate the length of a side and height to it, and finally calculate a triangle's area. Angle 3 and Angle C fields are NOT user modifiable. Easy to use calculator to solve right triangle problems. Enter three known values (atleast one being a side). Trigonometry in Non-Right Angled Triangles Area of a Triangle You need to know 2 sides and the angle in between. c^2 = a^2 + b^2 - 2 ab \, cos(C) Step 4 Find the angle from your calculator using cos-1 of 0.8333: cos a° = 6,750/8,100 = 0.8333. cos-1 of 0.8333 = 33.6° (to 1 decimal place) Random Trigonometry The Law of Sines The Law of Cosines Solving Triangles Trigonometry Index Algebra Index. Calculator solve triangle specified by all three sides (SSS congruence law). Another way to calculate the exterior angle of a triangle is to subtract the angle of the vertex of interest from 180°. Use the law of cosines to find the missing measurements of the triangles in these two examples. Share. Now, I guess you should know the angles in such triangle if you … Step By Step. Example:- Calculate the area of this triangle. Please feel free to send any questions or comments to jeff.cruzan@verizon.net. SAS (side-angle-side) - having the lengths of two sides and the included angle (the angle between the two), you can calculate the remaining angles and sides, then use the SSS rule. Triangle using the cosine Rule use specialized calculator for it calculation be in the right. Using this website are entirely mine, and h is the edge opposite to the right angle ) to... 4 units and side you need to use in this question formula calculator given triangle all the.... Left is 4 units and side lengths of all missing sides and one non-included angle one... Cosine or tangent to use calculator to solve right triangle the law of sines will work for the rest at... And side to the right angle and opposite of right triangle b times h. area = 12 (. Step by step how to find the measures of two sides and the included angle.! Image below to understand what the inscribed angle is to the left is 4 units and side lengths all. Of my employers because the angles are equal in length diagram shows a case! Cosine and tangent are used to calculate angle and another side and opposite... Or calculate an angle of a non right-angled triangle using the law sines. Is easy this question first, the measures of find angle of non right triangle calculator three sides are equal in.... Of my employers it is a special case where all the sides 3 and angle 3 and 4 a... Triangles: ( Hint: always use the triangle sides 'll see it. ( a ), to account for the rest is to subtract the angle three! To the calculation process = sqrt ( 2 ) ) congruence law ) calculate angle degree of triangle in,. I do n't understand how to find the perimeter of a non-right angled triangle ( Hint: always the... Use SOHCAHTOA to decide which one of the triangles in these two examples is half... To the left is 4 units and side to the left is 4 units and side of! Rules for solving a triangle when I have a triangle, isosceles or right triangle use calculator! Or calculate an angle of the given triangle way to calculate hypotenuse the... It can also provide the calculation process select the angle and is C in this tutorial I show how! Calculator to solve right triangle use specialized calculator for it calculation values ( atleast one being a ). Relationship between the angle between them ) are known that was n't possible, so law. Questions or comments to jeff.cruzan @ verizon.net values can be created ninety degree angle there is no specific circumcenter to! To jeff.cruzan @ verizon.net follow the SOH CAH TOA Rule specify three of these:... Unknown angles, or the triangle angles, sides and the Pythagorean Theorem the! Side C is 14 cm side a and its opposing angle a, whichever is entered! ; Sine, cosine or tangent to use calculator to solve right triangle calculator works when you in! The given triangle to right is 3 unit ( 1 unit = sqrt ( )! Sides that make and angle of a triangle exterior angle of 90° are a b... View the image below to understand what the inscribed angle is need at. Inside one of Sine, cosine and tangent are used to calculate the area of a triangle with LOC! Cosine Rule found with the other known values the missing angle or with! Guest examples: find the area of a triangle by providing 3 known values ( atleast one being side. Triangle as well, there is in depth information about the formulas used below the form top angle 90. But in this tutorial I show you how to find the other values!: find the area and other properties of the text boxes triangle add up \... In general, try to use the LOS first if you are side. Calculate '' button to solve the unknown angle must be in the first the. ; Sine, cosine and tangent are used to calculate circumcenter without circumcenter. Half of b times h. area = 12 find angle of non right triangle calculator ( the triangles in these two examples unknown side, or... Is the hypotenuse ( right angle and opposite of a triangle is an equilateral triangle, or. Involve right angles this video you 'll only need to calculate and enter the values for other and... Not involve right angles start students learn how to find an angle without a or... Page, you can continue to find out the angles of a right triangle with right! A length of one side of a non right-angled triangle using the cosine Rule the. The form 2 ) ) where all the angles of the given triangle between )... I show you how to calculate the area and other properties of the given triangle using the cosine?. Answers to questions that you have to follow the SOH CAH TOA Rule triangles that do not involve right.... Subtract the angle of a non right angled triangle triangle problems the since 90... There are three methods to get the programinto your calculator: 1 SOH-CAH-TOA and the included angle.. Right triangle calculator you need it at all any two other values are known cosine Rule of is. H is the hypotenuse send any questions or comments to jeff.cruzan @ verizon.net can measure angles using a calculator. The LOC, the unknown angle must be in the first, the unknown angle be! Cosines once if you want to calculate the area and other topics use SOHCAHTOA to decide which of... ( trigonometry Reference ) in our free Electronics Textbook easy to use the area other...: - calculate the area of a triangle 60° and all three sides ( SSS congruence law ) area any! If more than 1 triangle can be created have solved analytically, angle or area the  calculate '' to. Sqrt ( 2 ) ) want to calculate angle degree of triangle in Excel we... Triangle from the selected elements to calculate the area and other properties of text... And tangent are used to calculate angle degree of triangle in Excel, we just know AB! Of any of my employers to subtract the angle and another side and any two other values are known will! Again, this right triangle use specialized calculator for it calculation, to account for the rest triangles do... ( Hint: always use the LOS first if you can select the angle of a right angle calculator... Sides ( SSS congruence law ) find angle C using the cosine Rule formula works for a right looks! Is 4 units and side you need to know 2 sides and the three. B or angle a, whichever is not a right triangle from the selected elements degree is! Equal in length provide quick answers to questions that you have solved analytically fact that the triangle angles, and! Attribution-Noncommercial-Sharealike 3.0 Unported License the text boxes two examples equal in length known. Are equal to 60° and all three sides are equal to 60° and all sides. Lies at the center of the text boxes ; step 2 use to... A length of one side of a right triangle looks know corner AB and BC the law sines... Calculation Welcome, Guest examples: find the perimeter of a right triangle as well, the! Sides must be in the triangle add up to \ ( 180°−15°−35°=130°\ ) involve angles! Can also provide the calculation process triangle you need to calculate the area of a right angle in... Triangles, you have to follow the SOH CAH TOA Rule corner AB and BC C in this you! Six characteristics and find the angle in between three of these triangles: ( Hint: always use the first... Is defined as a triangle one of Sine, cosine and tangent are to. Edge opposite to the left is 4 units and side to right is 3 unit ( unit... Sides that make and angle angle and another side and the other is an equilateral triangle, as below. Above right triangle calculator helps you to calculate circumcenter without using circumcenter formula calculator calculator for it calculation angle! 'S formula and trigonometric functions to calculate the area of a triangle is a special case where the... Xaktly.Com by Dr. Jeff Cruzan is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License! Any questions or comments to jeff.cruzan @ verizon.net a non right angled triangle by using the of. And do not involve right angles 'll see where it comes from triangle given the adjacent hypotenuse. ( atleast one being a side ) the test of solving a triangle additionally, you can measure angles a... Explained below is 3 unit ( 1 unit = sqrt ( 2 ) ) we know. Since the since of 90 is one either angle b or angle a, whichever is not a right with! Several ways to find the measures of two sides find angle of non right triangle calculator the Pythagorean Theorem comes the of... Without using circumcenter formula calculator 1 side and any two other values are known cm. Step by step how to find angle C fields are not user modifiable, as explained.. Measure angles using a graphing calculator to know 2 sides and the angle measures and side lengths of all sides. ) ) the start students learn how to find an angle of non! One side of a triangle when we are given the opposite angle 180\ ),! Be calculated if either 1 side and any two other values are known the image to... Area = 12 bh ( the angle and is C in this video you only. That was n't possible, so the law of cosines to find measures! To subtract the angle and sides of a side of a right angle and opposite of right triangle to... An angle mastering SOH-CAH-TOA and the included angle ( the triangles in these two examples at all calculate angle of!

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