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 Related Terms
 Closed Curve:  A curve that can be traced using the same starting and stopping points, and without crossing or retracing any part of the curve.
Polygon: A closed figure formed by three or more line segments.
Curve: A set of points that form or can be joined by a continuous line on a graph (See Figures A and B below).
Circle: The set of all points in a plane that are the same distance, called the radius, from a given point, called the center.