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Geometric Formula for Sector of Circle

In the simplest form of definition, sector of a circle is a pie shaped portion of the area of the circle. It is a region bound by two radii and an arc lying between two radii.

A sector of a circle :

circle graphic

Area of Circle Sector: (with central angletheta)

    If the angle thetais in degrees, then area = (theta/360)x PI r2

    If the angle thetais in radians, then area = ((theta/(2PI))x PI r2

 

 
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