Disk (mathematics)

Plane figure, bounded by circle

In geometry, a disk (also spelled disc) 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.

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Disk (mathematics)

Plane figure, bounded by circle

In geometry, a disk (also spelled disc) 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.

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From Wikipedia

In geometry, a disk (also spelled disc) 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. For a radius r {\displaystyle r} , an open disk is usually denoted as D r {\displaystyle D_{r}} , and a closed disk is D r ¯ {\displaystyle {\overline {D_{r}}}} . However in the field of topology the closed disk is usually denoted as D 2 {\displaystyle D^{2}} , while the open disk is int ⁡ D 2 {\displaystyle \operatorname {int} D^{2}} .

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