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Question -

A well with 10 m inside diameter is dug 8.4 m deep. Earth taken out of it is spread all around it to a width of 7.5 m to form an embankment. Find the height of the embankment.



Answer -

Diameter of the well = 10 m 10
∴ Radius (r) = 10/2 = 5 m
Depth (h) = 8.4 m
∴ Volume of earth dugout =πr2h

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