how many cubic metres of earth must be dug out to sync a well which is 20 m Deep and has a diameter of 7m? If the earth so dug out is spread out over a rectangular plot 14 metre into 11 m , what will be the height of platform so formed
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m³ of earth must be dug=volume of cylinder
volume of cylinder=πr²h
=(22/7)×(35/10)×(35/10)×20
=11×35×2
=11×70
=770m³
according to the condition
volume of cylinder=volume of cuboid
platform=cuboid
volume of platform=l×b×h
770=11×14×h
770/(11×14)=h
h=5
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