None. It's a hole!
If you mean how much volume of dirt was extracted to create that cylindrical hole:
volume = π x radius2 x depth
= π x (10/2 in)2 x 6 ft
= π x (10/2 in)2 x (6 x 12 in)
≈ 5654 cu in
≈ 3.27 cu ft
but note that if the dirt was dug out bit by bit and not extracted as a cylindrical core, the volume of the resultant heap of dirt will have a larger volume as there will be air included in it.
none there is no dirt in a hole
cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
1.963 cubic feet
None. If it's a hole, then the dirt has been removed.
There is 98.17477042 cubic feet of dirt in a 5 foot deep hole that is 5 foot across.
There is no dirt in a hole that is 3 feet deep and six inches in diameter.
none there is no dirt in a hole
none.
None! If there was dirt in it then it wouldn't be a hole.
cylinder 18 feet diameter x 1.5 feet deep volume = 381 cubic feet
1.963 cubic feet
None. If it's a hole, then the dirt has been removed.
There is 98.17477042 cubic feet of dirt in a 5 foot deep hole that is 5 foot across.
6,400 ft3
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.
8 cubic feet.
1 foot by 36 sq feet = 36 cubic feet of dirt is needed