Volume = Length x width x height
=4x15x15
=900 Cubic Feet
5,974 gallons.
There is no dirt. It's a hole.
There is no dirt in a hole that is 3 feet deep and six inches in diameter.
15 1/3 feet
Assuming the pond is a cuboid: volume = length x width x height = 12 x 4 x 4 = 192 cubic feet.
10 feet?
The triangle's area = 52.5 feet2 if one side is 7 feet and the other side is 15 feet.
If it's a hole, there would be no dirt in it, right?
36 cubic feet of dirt=)
none
96 cubic feet
None but the hole can be filled in with dirt with the given dimensions.