Answer:
53.1°
Step-by-step explanation:
Look at the right triangle formed. You are given the Hypotenuse and an adjacent side to the angle needed to calculate the measure of the arc.
To find measure of angle use Cosine
Once you find measure of angle (central angle), you'll have the measure of the arc because they are the same.
cos -1 (9/15) = 53.13
