Question

how many cubic meter must be dug out to make well 20m deep 2m diameter. If the soil is laid out to make platform around the well with the height of 50cm . find the width of the platform with the well?

Answer 1

3*pie*r²*h = 3*22/7*5*5*20
= 500*22/3
=50=500*22/3
=220/3
=73.333