Three cubic feet is the capacity of a solid, such as a rectangular solid that measures 1' x 1' x 3'.
A three-foot cube would be a solid that measures 3' x 3' x 3', which equals nine cubic feet.
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A 3 foot cube has edges that are three feet long and a total volume of 27 cubic feet. 3 cubic feet describes a cube with edges the cube root of 3 long. (about 1.44225 feet)
2 (cubic feet) = 14.961039 US gallonsA two-foot cube, a cube that measures two feet on each side, has a volume of eight cubic feet or about 60 gallons.
Radius is the cube root of 900/4pi = 4.152830592 feet
Because the unit is in cubic feet, not feet, you can't just divide by twelve (because there are twelve inches in a foot.) You have to cube the amount of inches in a foot, (being twelve,) to find out how many cubic inches are in one foot. Twelve cubed is 1,728, so there are 1,728 cubic inches in a foot. From there you just multiply by three, giving you 5,184.
If you are asking for the volume, it would be 20 x 20 x 20 = 8000 cubic feet