Question

a circular well of 21 m deep is dug up o that the radiusof the well is 1.5 m what is the volume of earth dug out

Answer 1

volume of cylinder=(pi)(r²h)
here height =21m
 & r=1.5m
∴ volume =(22/7)(1.5² × 21)
                =22×2.25×3
                =22×6.75     
                =148.5.
∴ the volume of the earth dug out is 148.5m³.