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A hole does not have dirt!
504 cubic feet
if you mean a 30 foot diameter circle, then pi x 152 x 3 = 2119.5 cubic feet of dirt
32 cubic feet
1 acre = 43,560 square feet.1 cubic yard = 27 cubic feetA slab of soil 1-ft deep covering 1 acre has a volume of 43,560 cubic feet= 43,560 / 27 = [ 1,613 and 1/3 ] cubic yards