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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.
When the triangle has a right angle, then use it, that is usually much simpler. When two angles are known, work out the third using Angles of a Triangle Add to 180Â°. Try The Law of Sines before the The Law of Cosines as it is easier to use.