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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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Not to be confused with circular section.
A circular sector, also known as circle sector or disk sector or simply a 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.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/d/da/Circle_arc.svg/320px-Circle_arc.svg.png)
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]