How many cubic feet of sand needed to fill a 18 foot diameter circle 6 inches deep?

Answer 1

This is a cylinder.

V(cyl) = pi r^2 h

pi = 3.141592....

r = 9 feet ( diamter = 2 radii )

h = 6 inches = 0.5 feet

Hence

V = 3.141592.... X 9^2 X 0.5 cu.ft.

V = 127.2345 cu.ft. ~ 127.25 cu.ft.

Answer 2

12 in = 1 ft

radius = ½ × diameter

volume cylinder = area_end × height

= π × radius² × height

= π × (½ × 18ft)² × 6 in

= π × (9 ft)² × (6 ÷ 12) ft

= 40.5π ft³

≈ 127.2 ft³

Answer 3

Approx 127.2 cubic feet.