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A well with 14m diameter is dug 8m deep. The earth taken out of it has been evenly spread all around it to a width of 21m to form as embankment. Find

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A well with 14m diameter is dug 8m deep. The earth taken out of it has been evenly spread all around it to a width of 21m to form as embankment. Find the height of the embankment.
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Volume of earth taken out`=pir^2h`
`=392pi`
`r_(outer)`=21+7=28m
`r_(i n n e r)`=7cm
Volume of embankment=Volume of earth taken out
`h(pi(28^2-7^2))=392pi`
`h=0.533m`.
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