10. Earth taken out on digging a circular tank
diameter: 7 m and depth 20 m is spread
around the tank uniformly to form
embankment of dimension 22 m 14
Calculate the height of embankment.
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Step-by-step explanation:
Diameter of circular tank=17.5m
∴ Radius=217.5m=8.75m
Width of earth embankment=4m
Height=2m
Let it be the depth of the well then volume of earth taken out of πr2h=722×(8.75)2×h
=722×100875×100875h
=722×435×435h ....(1)
Volume of platform formed by earth taken out
=π{(451)2−(435)2}×2
=2×722×16(51−35)(51+35)
=2×722×1616×86
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