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Arc
Two endpoints on a circle and all of the points on the circle between those two endpoints.
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Center
The point from which all points on a circle are equidistant.
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Central Angle
An angle whose vertex is the center of a circle.
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Chord
A segment whose endpoints are on a circle.
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Circle
A geometric figure composed of points that are equidistant from a given point.
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Circle Segment
The region within a circle bounded by a chord of that circle and the minor arc whose endpoints are the same as those of the chord.
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Circumscribed Polygon
A polygon whose segments are tangent to a circle.
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Concentric Circles
Circles that share a center.
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Diameter
A chord that intersects with the center of a circle.
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Equidistant
The same distance. Objects can be equidistant from one another.
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Inscribed Polygon
A polygon whose vertices intersect with a circle.
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Major Arc
An arc greater than 180 degrees.
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Minor Arc
An arc less than 180 degrees.
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Point of Tangency
The point of intersection between a circle and its tangent line or tangent segment.
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Radius
A segment with one endpoint at the center of a circle and the other endpoint on the circle.
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Secant Line
A line that intersects with a circle at two points.
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Sectors
A region inside a circle bounded by a central angle and the minor arc whose endpoints intersect with the rays that compose the central angle.
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Semicircle
A 180 degree arc.
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Tangent Line
A line that intersects with a circle at only one point (the point of tangency).
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Tangent Segment
A segment with one endpoint at the point of tangency of a circle and the other endpoint on the tangent line.