# A well with 10 m

Given,

Inside diameter of well = 10 m

So, inside radius of well =

Depth of well = 8.4 m

Earth spread out at height up to = 7.5m

So, outer radius R = 7.5+5= 12.5 m

Let height of embankment = H meter

So ,

volume of earth in embankment = volume of earth dug out

= π(R2 –r2) = πr2h

= π(12.52 – 52) ×H = π×52×8.4

= 17.5×7.5×H = 25×8.4

=

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