A well of diameter 3m and 14 m deep is dig .The earth,taken out the It has been evenly spread all around it in a shape of a circular ring of width 4m to form embankment .find the height of embankment
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Radius (r1) of the well = 3/2 m
Volume of earth dug= pi×r1^2×h
= 22/7×3/2×3/2×14
=99 m^3
Outer radius (r2) of the embankment =3/2+4
= 11/2 m
Area of the base of the embankment= pi(r2^2-r1^2)
= 22/7×112/4
= 22/7×28
=88m^2
Height of the embankment =
Volume of earth dig ÷area of the base
=99/88
=1.125 m
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