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A well of diameter 3 m 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 4 m to form an embankment. Find the height of the embankment.

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Solution: Radius of well = 1.5 m, depth of well = 14 m, width of embankment = 4 m

Radius of circular embankment = 4 + 1.5 = 5.5 m

Volume of earth dug out

10 surface area volume exercise solution

Area of top of platform = (Area of bigger circle – Area of smaller circle)

10 surface area volume exercise solution

Height = Volume/Area

10 surface area volume exercise solution

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