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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The surface area of a 21 foot in ground pool is 346.36 square feet.
273
If you mean the diameter is 27 feet, then the radius is 13.5 A = pi x r2 = 3.14 x 13.52 = 572.265 sq ft
Can't be done. You need to specify the width and length of the pool. That is because the area of a long, narrow pool is not the same as the area of a pool that is closer to square.
24 feet long.