Sector
A sector of a circle is a region bounded by two radii of the circle and an arc.
If the central angle of the sector is (or ), then the sector is a semicircle.
Area
The area of a sector is found by multiplying the area of circle by , where is the central angle in radians.
Therefore, the area of a sector is , where is the radius and is the central angle in radians.
Alternatively, if is in degrees, the area is .
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