Assuming the pool is a perfect circle, it is 18 x pi feet or about 56.55 feet.
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since c of the pool is 18 then 2pieR = 18 /2 pieR=9 /pie R=9/pie the radius is 9/pie
Circumference of the circular pool: 20*pi feet
Diameter = Circumference/pi
Circumference is pi times diameter. Diameter is circumference divided by pi. Diameter is twice the radius. Radius is half the diameter.