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To find the surface are of the pool we need to make use of two formulae:

1) Circumference = pi x diameter and 2) area = pi x radius2.

First:

21 = pi x D

D = 6.68450761

So the radius = 6.68450761/2 = 3.342253805

Now:

Area = pi x 3.3422538052

= 35.09366495

= 35 square feet (nearest whole number)

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14y ago

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Anonymous

4y ago
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Q: What is square footage of 21 foot round pool?
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