Quadrilateral Abcd Is Inscribed In This Circle. What Is The Measure Of ∠A? Enter Your Answer In The Box. °. What is the measure of angle b? Enter your answer in the box.

What is the measure of ∠a ? The vertices of the quadrilateral lie on the edge of the circle and are labeled as a, b, c, d. The angle c is labeled as (x + 15) degrees.