Question

7. In the figure above, triangle ABC is inscribed in the

circle with center O) and diameter |AC. If AB = AO,
what is the degree measure of ABO ?
(A) 15°
(B) 30°
(C) 45°
(D) 60°
(E) 90°
.

Answer 1

Answer: D
It’s D because AO is a radius.

Answer 2

AO is a radius, as is BO, and we have AB = AO so

AB = BO = AO

and this is an equilateral triangle, three 60 degree angles.

Answer: D