Question

a cylinder well is 25 meters deep and has a diameter of 1.8 meters. Approximately how many cubic meters of soil were dug our to make the well?

Answer 1

The formula for volume of a cylinder is V= PI x r^2 x H

r = radius = 1/2 diameter = 1/2*1.8 = 0.9 meters
Height = 25

Volume = PI x 0.9^2 x 25 
= PI x 0.81 x 25
= PI x 20.25
= 63.62 cubic meters