GRE Math Review 3 GEOMETRY

The area of a circle with radius r is equal to pi r squared. For example, the area of a circle with radius 5 is pi, times 5 squared = 25 pi. A sector of a circle is a region bounded by an arc of the circle and two radii. In the circle in Geometry Figure 23 above, the region bounded by arc ABC and the two radii is a sector with central angle 50º. ................
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