Chapter 3 - Parallel and Perpendicular Lines - 3-2 Properties of Parallel Lines - Apply What You've Learned - Page 155: e

90

$\angle32$ is a same-side interior angle to the angle below it that is marked as a right angle. Right angles measure 90, and the same-side interior angle postulate tells us that same side interior angles are supplementary. If one angle of a supplementary pair measures 90, then the other measures 90.