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The volume of a 300mm diameter by 600mm deep cylinder is: 42,412,000 mm3
One cubic meter cannot be "converted" to a square measure unless we know how "deep" it is being spread. For example, if it is one meter deep, then it would cover one square meter; but if it is two meters deep, then it would cover half that area. If it were, say, 1 cm deep, then it could cover a million square centimeters (100 x 100 x 100).
I'm assuming you mean one meter deep with a one square meter footprint. The answer is 1*1*1=1m^3 = one cubic meter. Actually, that is how much dirt was taken out to make the hole. There should be no dirt in the hole, otherwise it wouldn't be a hole.
A 28 meter square is 28 times 28 meters or 784 square meters. If it is one tenth of a meter (10 cm) deep, it has a volume of 78.4 cubic metersIf you mean 28 square meters (like a pool 4 meters by 7 meters) then the volume one tenth of a meter deep is 2.8 cubic meters.
It all depends on how deep the hole it's in is. It could be just over a meter, or it could be deeper than 5 feet.