A cylinder has a volume of 315 pi cubic meters and a height of 21 meters. What is the area of the base?

A cylinder’s volume equals its base area times its height: V = Bh. Divide the volume, 315π cubic meters, by the height, 21 meters: 315π ÷ 21 = 15π square meters. Therefore, the base area is 15π square meters, choice C.

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