Question

a well of diameter 3m is dug 14 m deep. the earth taken out of it has been spread evenly all around it in the shape of a circular ring of width 4m to form an embankment. find the height of embankment.​

Answer 1

$volume \: of \: well = volume \: of \: embankmen\\ \pi {r}^{2} h \: \: \: \: \: \: \: \: = \pi( {r }^{2} - {r}^{2} )h$

height

$height = 1.125m$