Angle Addition Postulates

1. Angle Addition Postulates K. Suazo December 1, 2005

2. Notes • First an angle is two rays that come together at a certain point. Also the rays are the sides of the angle and the point is called a vertex. • Ex. side vertex side A postulate is a rule that is accepted without proof. So an example of an angle addition postulate is: If p in the interior of RST, then m RSP + m PST= m RST RST R sRSP PST P T

3. Practice Problems • Use the Angle Addition Postulate to find the measure of the unknown angle. angle DEF d g 60 • 1. e 45 f 95 100 105

4. Practice Problems • Use the Angle Addition Postulate to find the measure of the unknown angle. Angle HJL h j 70 • L 40 k 50 80

5. Practice Problems • Use the Angle Addition Postulate to find the measure of the unknown angle. Angle QNM • Q p 80 110 n 70 m 55

6. Practice Problems • Use the Angle Addition Postulate to find the measure of the unknown angle. Angle WXY • X w 80 35 y 120 a 100 115

7. Practice Problems • Use the Angle Addition Postulate to find the measure of the unknown angle. Angle GHE • G h I 70 145 35 e 88.5

8. You Did IT!!!!!

9. Reference Page • Class Notes • McDougal Littell Geometry Book