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# How to dind a missing angle from a triangle?

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How to dind a missing angle from a triangle?    Aug 28, 2017

#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
+1

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