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In geometry, a circular segment is a region of a circle which is "cut off" from the rest of the circle by a secant or a chord.
Area = radius2 * (π * θ - sin(α))
A = r2 * (π * α - sin(α)) =
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"Segment of a Circle Area" Math @ STANDS4. STANDS4 LLC, 2018. Web. 14 Dec. 2018. <http://math.stands4.com/calculators/circle-segment-area>.