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Introduction to Angles

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.

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Introduction to Angles

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  1. Introduction to Angles Complementary and Supplementary

  2. 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.

  3. 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.

  4. Naming Angles ABC A • Use the vertex and a point from each ray to name the angle. The vertex must be the middle letter. CBA B C Sometimes we put this symbol in front of an angle:

  5. Vertexes and Sides

  6. 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.

  7. Example: Complementary Angles

  8. Supplementary Angles • Two angles are called supplementary angles if the sum of their degree measurements equals 180 degrees. • Supplemental Angles make a Straight Line.

  9. Example: Supplementary Angles

  10. Find the complementary and supplementary angles for each.Use half sheet of paper. • 73 2) 40 3) 29 • 87 5) 56 6) 13

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