The area of a cilinder is Pi r 2 x h (where h is the height of the pool. the result is given in f3 , and Pi is= 3.1416.. so you have: r= 21/2= 10.5 f then 3.1416 x (10.5)2x 5 f the the Volume of the pool given for example 5 f tall is=1731.8 f3
convertin to galons =
12 954.763 Galons
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1 cubic foot = 7.48051945 US gallons21 cubic feet* 7.48051945 = 157.090908 US gallons