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Diameter = 18/pi = 5.73 feet, approx.
fifty-six The circumference of an 18-foot diameter circular swimming pool is: 56.55 feet
If that is 4 feet tall and 18 inches in diameter, it would be 16.83 gallons.
18 ft diameter is assumed. Area = Pi/4 x 182 = Pi x 81 = 254.469 ft2
216 square feet (12 x 18 = 216)