33.5 cubic feet.
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112 cuft
if you mean a 30 foot diameter circle, then pi x 152 x 3 = 2119.5 cubic feet of dirt
An 8-foot diameter circle has a circumference of about 25.132 inches.
A circle with a diameter of 18 feet has a perimeter of 56.5 feet.
ABOUT 43 bags. Dry sand weighs ABOUT 100 lbs per cubic foot- and you need 21.3 cubic feet.