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In Geometry , a disk (also spelled '''disc''') is the region in a Plane contained inside of a Circle . A disk is said to be ''closed'' or ''open'' according to whether it contains or not the circle which is its boundary. In Cartesian Coordinates , the open disk of center and radius ''R'' is given by the formula : while the closed disk of the same center and radius is given by : The Area of a disk of radius ''R'' (whether open or closed) is π''R''2 (see π ). A ''ball'' is a disk in a space with more than two dimensions. See Ball (mathematics) . Sometimes however, one uses the word "disk" Synonymously with "ball", allowing a disk to have other dimensions. SEE ALSO |
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