Question

ZA and B are supplementary angles.

If ZA measures 45°, then what is the measure of ZB?
O 35
O 45
O 135
O 145

Answer 1

135°

Explanation:

a supplementary angle is equal to 180°. since you already have the measure of ZA, all you need to do is subtract 45°, the measure of ZA, from 180°, the total measure of a supplementary angle, in order to figure out the measure of ZB.

180 - 45 = 135, therefore the measure of ZB = 135°.