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Area of Sector of a Circle
A portion of a disk whose upper boundary is a (circular) arc and whose lower boundary is a chord making a central angle radians ( ), illustrated above as the shaded region. The entire wedge-shaped area is known as a circular sector.
Let be the radius of the circle, the chord length, the arc length, the height of the arced portion, and the height of the triangular portion. Then the radius is R = h + r
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