Question

How many cubic m of soil must be dug to make a well 20 m deep and 2m in diameter . If the curved surface of the well is to be plastered at a rate of Rs. 50/meter square , find the cost of plastering?

Answer 1

Volume of soil to be taken out
=$\pi r^{2} h$
=$\frac{22}{7}* 1^{2} *20$
 =62.85 cubic m.   

Answer 2

it is 62.8 cubic meter...........