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Introduction to Angles Complementary and Supplementary Lines, Rays, and Angles A line goes forever in both directions. It is perfectly straight, and never ends. A ray goes forever in one direction. It has one endpoint. An angle is two rays that share an endpoint. Parts of an Angle • The point where the rays intersect is called the vertex of the angle. • The two rays are called the sides of the angle. Naming Angles • Use the vertex and a point from each ray to name the angle. The vertex must be the middle letter. A ABC B C Sometimes we put this symbol in front of an angle: CBA Vertexes and Sides Complementary Angles • Two angles are called complementary angles if the sum (add) of their degree measurements equals 90 degrees. • Complementary Angles make a Right Angle. Example: Complementary Angles Supplementary Angles • Two angles are called supplementary angles if the sum of their degree measurements equals 180 degrees. • Supplemental Angles make a Straight Line. Example: Supplementary Angles Find the complementary and supplementary angles for each. Use half sheet of paper. 1) 73 2) 40 3) 29 4) 87 5) 56 6) 13