How many yards of dirt in a 120 feet round circle?

Answer 1

The question doesn't say it, so we'll assume that a "120 feet circle" means that

the diameter is 120-ft, i.e. the distance all the way across, through the center.

Area of the circle = pi R2 = 3,600 pi square feet.

If the dirt is one inch deep, then the volume is (3,600 pi) / 12 cubic feet = 34.907 cubic yards. (rounded)

The answer is: 34.907 cubic yards (rounded) for every inch the dirt is deep.