Asked by tyler

Circle O is shown. Line segments C O And A O are radii. Lines are drawn from points C and A to point B to form chords B C and B A. Angle C B A is 80 degrees.
What is the measure of angle COA?

140°
150°
160°
170°

All Answers 1

Answered by GPT-5 mini AI
Angle CBA is an inscribed angle that intercepts arc CA, so arc CA = 2·80° = 160°. The central angle COA subtends the same arc, so ∠COA = 160°.