Question

Find the measure of A.
A. 50
B. 70
C. 100
D. 90

Answer 1

Explanation:

I believe it is 90

Answer 2

D

Explanation:

I don't know how to eliminate the wrong answers.

Two line segments which have one end at a diameter and the other end meeting at a common point, make a 90 degree angle.

A is made that way, so A is 90 degrees.