Disk (mathematics)
Plane figure, bounded by circle / From Wikipedia, the free encyclopedia
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"2-ball" redirects here. For the basketball event, see 2Ball.
For other uses, see Disc.
In geometry, a disk (also spelled disc)[1] is the region in a plane bounded by a circle. A disk is said to be closed if it contains the circle that constitutes its boundary, and open if it does not.[2]
For a radius, , an open disk is usually denoted as and a closed disk is . However in the field of topology the closed disk is usually denoted as while the open disk is .