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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.
Many people think that an angle is some kind of. slanted line. But in geometry an angle is made up of two rays that. have the same beginning point. That point is called the vertex and the two rays are called the sides. of the angle. To name an angle, we use three points, listing the vertex in the middle. This is angle DEF or â DEF. We can use the symbol â  for angle. 1. Write if each figure is a line, ray, line segment, or an angle, and name it.