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Let ? be the central angle, in radians, and r the radius. The total area of a circle is pr2. The area of the sector can be obtained by multiplying the circle's area by the ratio of the angle and 2p (because the area of the sector is proportional to the angle, and 2p is the angle for the whole circle) Also, if ? refers to the central angle in degrees, a similar formula can be derived. Sectors can have special relationships, which include halves, quadrants, and octants.
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