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If 21 feet is the diameter, divide it by 2 to get the radius. Then use the formula for a circle: area = pi x radius2.

350 sq ft

NOT the 35 the other people answered. A sheet of plywood 4' by 8' is 32 Sq ft thats a really small pool.

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12y ago

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Q: What is the square foot of a 21 foot round pool?
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