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

3. 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 s RSP PST P T

4. 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

5. Practice Problems Use the Angle Addition Postulate to find the measure of the unknown angle. Angle HJL h j 70 1.L 40 k 50 80

6. Practice Problems Use the Angle Addition Postulate to find the measure of the unknown angle. Angle QNM 1. Q p 80 110 n 70 m 55

7. 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

8. Practice Problems Use the Angle Addition Postulate to find the measure of the unknown angle. Angle GHE 1. G h I 70 145 35 e 88.5

10. Reference Page Class Notes McDougal Littell Geometry Book