Question

how many cubic metres of Earth must be dug out to sink a well 21m deep and 6m diameter​

Answer 1

Answer

Diameter of well = 6m

∴  Radius(r) = 6/2 = 3m

and depth (h) = 21m

∴ The volume of earth dugout= πr²h

                                                    = 22/7×3×3×21m³

                                                    = 594m³