Question

How many cubic metres of soil must be dug out to make a well 20m deep and 2m in diameters

Answer 1

depth of well(h)= 20m
diameter=2m
radius=1m
shape of well=cylinder
cubic meter meters of soil required=volume of well.
volume of well=22%7×1×1×20
=22/7×20
=62.8cm cube.

Answer 2

Answer:

62.8 cubic meters

Step-by-step explanation:

How many cubic metres of soil must be dug out to make a well 20m deep and 2m in diameters

To Find how many cubic meters of soil must be dug

We need to calculate the volume of well

Since well is in shape of cylinder

Formula of Volume of cylinder = $\pi r^{2} h$

SInce diameter is 2m

So radius = diameter/2 = 2/2 =1m

Height = 20m  

Use π = 3.14

Volume of well =  $3.14*1*1*20$

                         = 62.8 cubic meters