A circular sector or circle sector (symbol: ⌔), is the portion of a circle enclosed by two radii and an arc, where the smaller area is known as the minor sector and the larger is known as the major sector.

Radius: R

Arc length: s

Central angle (in radians): x

Central angle (in degrees): α

Perimeter: L

Area: S

- $s=Rx$
- $s={πRα}/180°$
- $L=s+2R$
- $S={Rs}/2={R^2x}/2={πR^2α}/360°$

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