Angle Addition Postulates K. Suazo December 1, 2005

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

Practice Problems  Use the Angle Addition Postulate to find the measure of the unknown angle. angle DEF d g 60  1. e 45 f

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

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

Practice Problems Use the Angle Addition Postulate to find the measure of the unknown angle. Angle WXY X w y 120 a

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

Reference Page Class Notes McDougal Littell Geometry Book