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In the last lesson we used the Law of Cosines to find the length of the third side of a triangle when you know the length of two sides and the angle in between. This law can also be used to find the measure of an angle when the three sides of a triangle are given. To use the Law of Cosines to find an unknown angle: 1. Identify c as the side across from the angle you are trying to find. 2. Substitute the values into the Law of Cosines.
 SSA  is when we know two sides and an angle that is not the angle between the sides. To solve an SSA triangle. 1  use The Law of Sines first to calculate one of the other two angles; 2  then use the three angles add to 180Â° to find the other angle;3  finally use The Law of Sines again to find the unknown side.o solve an SSA triangle. 1  use The Law of Sines first to calculate one of the other two angles; 2  then use the three angles add to 180Â° to find the other angle; 3  finally use The Law of Sines again to find the unknown side.