You work for a landscape company. you are told to fill a 20 foot diameter flower bed with mulch 6 inches deep. you calculate that it will take about 1,885 ft3 to fill the flower bed.

The flower bed has the shape of a cylinder with a 20-ft diameter and a 6-inch height.

6 in. = 0.5 ft

Volume of cylinder = pi * r^2 * h

diameter = 20 ft
radius = 10 ft

V = 3.14 * (10 ft)^2 * 0.5 ft

V = 157 ft^3

1885 ft^3 is incorrect because the 6-in. depth, which is the height of the cylinder, was not converted to ft.

Hi!

Assuming the 9in is the radius, we would multiply it by 2, or add it to itself. We then get 18 in.

Hope this helps!