Answer: The measure of the indicated angle is 60°.
Explanation:
Since we have given that
A regular hexagon is inscribed in a circle.
He needs to cut a diamond to fit into each of the triangles.
Since regular hexagon has 6 sides.
And the completer angle of circle = 360°
so, Measure of the indicated angle is given by

Hence, the measure of the indicated angle is 60°.