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the answer is 20
As it is a hole there is no dirt in it. However, a cylinder of dirt with radius 1.5ft, depth 5ft and a volume of πr2h ~= 35.34 cu ft has been removed.
3.4 miles is 17952ft r2 = 4400/17952pi r= 0.28 ft
No. Radius is half of the diameter.
(radius+radius) times pi