An inscribed angle is an angle formed by two chords in a circle that share an endpoint. This endpoint is called the vertex of the angle, and the other endpoints of the chords lie on the circumference of the circle. The key properties of an inscribed angle are: 1. **Measure**: The measure of an inscribed angle is equal to half the measure of the intercepted arc (the arc that lies between the two points where the chords intersect the circle).
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