Question:
how many cubic metres of earth must be dug out to sink a well which is 20 m deep and has a diameter of 7 m
Answer:
Given, diameter of the wall = 7 m
So, radius of the wall r = 7/2 m
and depth/height of the wall = 20 m
Now, volume = πr2 h
= (22/7)*(7/2)2 *20
= (22*7*7*20)/(7*2*2)
= 11*7*10
= 770 m3
So, 770 m3 of earth must be dug out to sink a well.
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