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→top: Footnote: avoid defining 'chord' and 'secant' in terms of a disc rather than a circle. Tags: Mobile edit Mobile app edit Android app edit |
→top: Correct my footnote: curve not circle. Tags: Mobile edit Mobile app edit Android app edit |
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[[Image:Circularsegment.svg|frame|right|A circular segment (in green) is enclosed between a secant/chord (the dashed line) and the arc whose endpoints equal the chord's (the arc shown above the green area).]]
In [[geometry]], a '''circular segment''' or '''disk segment''' (symbol: <span style="font-size:1.5em">⌓</span>) is a region of a [[disk (mathematics)|disk]]<ref>Mathematics distinguishes when necessary between the words ''circle'' and ''disk'': a disk is a plane area having a circle as its boundary, while a circle is the closed curve forming the boundary itself.</ref> which is "cut off" from the rest of the disk by a straight line. The complete line is known as a ''[[secant line|secant]]'', and the section inside the disk as a ''[[chord (geometry)|chord]]''.<ref>
More formally, a circular segment is a [[Plane (mathematics)|plane region]] bounded by a [[circular arc]] (of less than π radians by convention) and the [[circular chord]] connecting its endpoints.
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