Question

How many cubic metres of earth must be dug-out to sink a well 21 m deep and 6 m diameter?

Answer 1

Given,

Height of cylinder = 21 m

Diameter of well = 6 m

radius of well = \(\frac{6}{2}\) = 3 m

so,

Amount of earth can be dug out from this well = πr²h = \(\frac{22}{7}\) x 3 x 3 x 21 = 594 m³