81
Assuming the 28 feet refers to the diameter of the circle, the answer is 1231.5 cubic feet, approx.
Without depth, the circle is a flat figure without volume ... zero cubic units.
33.5 cubic feet.
It depends upon whether the 24' is the radius, diameter or circumference.
5200 cubic feet
if you mean a 30 foot diameter circle, then pi x 152 x 3 = 2119.5 cubic feet of dirt
The question doesn't say it, so we'll assume that a "120 feet circle" means thatthe diameter is 120-ft, i.e. the distance all the way across, through the center.Area of the circle = pi R2 = 3,600 pi square feet.If the dirt is one inch deep, then the volume is (3,600 pi) / 12 cubic feet = 34.907 cubic yards. (rounded)The answer is: 34.907 cubic yards (rounded) for every inch the dirt is deep.
24 cubic feet = 0.89 cubic yards
You don't. Cubic feet is a measure of volume. Volume is a property of 3-dimensional objects. A circle is a two-dimensional object, it does not have a volume. You could find the cubic feet in a sphere, but not in a circle.
9.27 cubic feet
If you are asking for "square" feet, the depth is irrelevent. The area would be 85 square feet If you want a figure which takes the depth of 4 inches into the account, the number of "cubic feet" would be roughly 28 cubic feet.