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   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.     
 
Ye kiske barabar hai
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