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 Related Terms
 Central angle:  Central angles are angles in which the vertex of the angle is the center of a circle.
Circle: The set of all points in a plane that are the same distance, called the radius, from a given point, called the center.
Center of a Circle: The point inside the circle that is the same distance from all of the points on the circle.
Angle: Region between two rays or the amount of rotation about a fixed point.