33.5 cubic feet.
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.
ABOUT 43 bags. Dry sand weighs ABOUT 100 lbs per cubic foot- and you need 21.3 cubic feet.
A circle with a diameter of 18 feet has a perimeter of 56.5 feet.
22/7x6x6x6 cubic inches
Depends on how deep you want to fill it...
330.78 ft3
112 cuft
.15
if you mean a 30 foot diameter circle, then pi x 152 x 3 = 2119.5 cubic feet of dirt
About 21 cubic feet
2.37 cubic yards.
0.148 cubic yard for every 3-inches deep
8*5*1/2 = 20 cubic feet.
24 cubic feet . . . (6'x6'x 0.67')
Without depth, the circle is a flat figure without volume ... zero cubic units.