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How to dind a missing angle from a triangle?

cheekycheekycoolcool

 Aug 28, 2017

Best Answer 

 #1
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If you know all the angles but 1, you can use the triangle sum theorem, which says that the sum of the measure of the angles of a triangles is 180 degrees. 

 

There are 2 equations that you will need, as well. They are the law of sines and the law of cosines. 

 

The law of sines:

 

\(\frac{a}{\sin A}=\frac{b}{\sin B}=\frac{c}{\sin C}\)

 

The law of cosines:

 

\(c^2=a^2+b^2-2ab\cos C\)

 

You can solve any triangle knowing these 3 formulas. 

 Aug 28, 2017
edited by TheXSquaredFactor  Aug 28, 2017
 #1
avatar+2340 
+1
Best Answer

If you know all the angles but 1, you can use the triangle sum theorem, which says that the sum of the measure of the angles of a triangles is 180 degrees. 

 

There are 2 equations that you will need, as well. They are the law of sines and the law of cosines. 

 

The law of sines:

 

\(\frac{a}{\sin A}=\frac{b}{\sin B}=\frac{c}{\sin C}\)

 

The law of cosines:

 

\(c^2=a^2+b^2-2ab\cos C\)

 

You can solve any triangle knowing these 3 formulas. 

TheXSquaredFactor Aug 28, 2017
edited by TheXSquaredFactor  Aug 28, 2017

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