Posted by **Alexa** on Thursday, September 17, 2009 at 9:37pm.

A careless person wrote, using the figure in the shape of a Y the the left ray is OA the right ray is OB and the straight ray is OC, the measure of angle AOB + the measure of angle BOC=measure of angle AOC.

What part of the Angle Addition Postulate did that person overlook?