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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.
Step 1, Count the number of sides in the polygon.Step 2, Find the total measure of all interior angles in the polygon. The formula for finding the total measure of all interior angles in a polygon is (âânââ â 2) x 180, where âânââ is the number of sides, as well as the number of angles, the polygon has.[1] Some common polygon total angle measures are as follows: The angles in a triangle (a 3-sided polygon) total 180 degrees. The ...Step 3, Determine if the polygon is a ...