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In a circle, the measure of an inscribed angle is half the measure of the central angle with the same intercepted arc.

**Click** on "arcs" to display the intercepted arcs.

**Click** and **drag** the points A, B and C around the circle.

**Click** on the protractor to use it.

- To show the difference between central angle and inscribed angle.
- To show that the measure of angle AOB is twice the measure of angle ACB if they intercept the same arc.