Inscribed Angle in Circle

In the diagram below, point $O$ is the center of a circle. Points $A$, $B$, and $C$ lie on the circle.

If the central angle $\angle AOB = 80°$, find the measure of the inscribed angle $\angle ACB$.

Note: You can upload a diagram showing a circle with center O and points A, B, C on the circumference to visualize this problem.