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2015-11-09T20:03:02+05:30

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Here is wat u need is given over here
height,h=21m
radius,r=1.5m
volume of earth dug out= pi*r ^{2}*h 
                                       =22/7*1.5*1.5*21
                                       =148.5
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2015-11-09T20:09:42+05:30
Volume of a cylinder = Volume of well = r²h
=( 22 * 1.5 * 1.5 * 21)/7
=66*2.25 
= 148.50 m³

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