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

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Diameter of earth dug out = 4 m

Radius of earth dug out = 2 m 

Depth of the earth 21

Height of emb  = 4 m.

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