In the figure shown, point O is the center of the

In the figure shown, point O is the center of the semicircle and points B, C, D lie on the semicircle. If the length of line segment AB is equal to the length of line segment OC, what is the degree measure of angle BAO? GMAT Explanation

képernyőfotó 2020 05 13 13.02.37

In the figure shown, point O is the center of the semicircle and points B, C, D lie on the semicircle. If the length of line segment AB is equal to the length of line segment OC, what is the degree measure of angle BAO?

(1) The degree measure of angle COD is 60º.
(2) The degree measure of angle BCO is 40º.

Correct Answer: D