CIRCLE

This article is about the shape and mathematical concept. For other uses, see Circle (disambiguation).
"360 degrees" and "360°" redirect here. For other uses, see 360 degrees (disambiguation).
Circle
Circle-withsegments.svg
A circle (black), which is measured by its circumference (C), diameter (D) in cyan, and radius (R) in red; its centre (O) is in magenta.
A circle is a simple closed shape. It is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves so that its distance from a given point is constant. The distance between any of the points and the centre is called the radius. This article is about circles in Euclidean geometry, and, in particular, the Euclidean plane, except where otherwise noted.

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