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Circular sector

Portion of a disk enclosed by two radii and an arc / From Wikipedia, the free encyclopedia

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A circular sector, also known as circle sector or disk sector (symbol: ), is the portion of a disk (a closed region bounded by a circle) enclosed by two radii and an arc, with the smaller area being known as the minor sector and the larger being the major sector.[1] In the diagram, θ is the central angle, the radius of the circle, and is the arc length of the minor sector.

The minor sector is shaded in green while the major sector is shaded white.

The angle formed by connecting the endpoints of the arc to any point on the circumference that is not in the sector is equal to half the central angle.[2]