Central Angle

A central angle is an angle whose apex (vertex) is the center O of a circle and whose legs (sides) are radii intersecting the circle in two distinct points A and B.

The central angle is subtended by an arc between those two points, and the arc length is the central angle (measured in radians) times the radius.

Central Angle
∠AOB is the central angle of the circle with the centre O.

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