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・ Disjunct matrix
・ Disjunction and existence properties
・ Disjunction elimination
・ Disjunction introduction
・ Disjunction property of Wallman
・ Disjunctive
・ Disjunctive cognition
・ Disjunctive graph
・ Disjunctive normal form
・ Disjunctive population
・ Disjunctive pronoun
・ Disjunctive sequence
・ Disjunctive sum
・ Disjunctive syllogism
・ Disjunctivism
Disk (mathematics)
・ Disk 413
・ Disk aggregation
・ Disk algebra
・ Disk array
・ Disk array controller
・ Disk buffer
・ Disk cache
・ Disk cartridge
・ Disk Cleanup
・ Disk cloning
・ Disk compression
・ Disk controller
・ Disk Copy
・ Disk Copy Fast


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Disk (mathematics) : ウィキペディア英語版
Disk (mathematics)

In geometry, a disk (also spelled disc)〔.〕 is the region in a plane bounded by a circle. A disk is said to be ''closed'' or ''open'' according to whether it contains the circle that constitutes its boundary.〔.〕
==Formulas==
In Cartesian coordinates, the open disk of center (a, b) and radius ''R'' is given by the formula〔
:D=\
while the closed disk of the same center and radius is given by
:\overline=\.
The area of a closed or open disk of radius ''R'' is π''R''2 (see area of a disk).〔.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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