: Mathématiques: circle

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circle

A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre. The distance between any point of the circle and the centre is called the radius. Usually, the radius is required to be a positive number. A circle with r = 0 (a single point) is a degenerate case.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Circle)

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