Question

A well of diameter 4m is dug 21m deep.the earth taken out of it has been spread evenly all around it in the shape of a circular ring of width 3m to form an embankment.find the height of the embankment?

Answer 1

The shape of well will be cyindrical,
Depth(h1) of well=21m
Radius (r1) of the circular end of well=42=2m
Width of embankment=3m
it can be observed that our embankment will be in cylindrical shape having outer radius(r2) as=3+2=5m
Let the height of embankment be h2.
Volume of soil dug from well=volume of earth used to form embankmentπr12h1=π(r22−r12)×h2π(2)221=π(52−22)×h24×21=21×h2h2=4m

Answer 2

I hope this will help you....
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