Question

PLEASE HELP

What is the measure of AC?

A. 42°
B. 132°
C. 138°
D. 48°

Answer 1

C. 138°

Explanation:

< ABC = 1/2 ( ac + de)

90 = 1/2 (ac +42)

multiply each side by 2

2*90 = 2*12/ (ac+42)

180 = ac+42

subtract 42 from each side

180-42 = ac

138 = ac