Quiz question please help

Question

The exterior sides of adjacent angles 1 and 2 are perpendicular. If BD is the bisector of < 1and BE is the Bisector of < 2, find the measure of < DBE.

Answer 1

45 degrees or pi/4 radians

half of 90 = 45

if the sides of the angles are perpendicular, they are 90 degrees apart. Take half of one angle and half of the other, they add to half their sum or 90/2 = 45 degrees