28 is the diameter of the pool and 4 is the height (depth). 1 cubic foot is approx. 7.48 gallons. A round swimming pool is a cylinder. So:
pi x (28/2)2 x 4 = 2463 cubic feet, multiply by 7.48 = 18423.24 gallons
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6015.77 gallons
It is 30.6 cubic feet = 190.3 Imperial gallons.
About 17,950 gallons.
1,770 gallons.
9,440 gallons.