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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.
1 Alternatively, if you know the length of all three sides of a triangle, you can find the area using Heronâs formula. Read Calculate the Area of a Triangle for complete instructions.  For example, if the base of the triangle is 12 meters, and the height of the triangle is 7 meters, to find the area you would calculate: