Volume of the cylinder made by the excavation is pi x r x r x h, where r is the radius and h is the height. So we have volume is pi x 2.5 x 2.5 x 40 = 785.39 cubic feet and must be the amount of soil removed.
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None. If it's a hole, then the dirt has been removed.
None. There is nothing in a hole.
none there is no dirt in a hole
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.
There is 98.17477042 cubic feet of dirt in a 5 foot deep hole that is 5 foot across.