a well of diameter 3m is dug 14m deep. the earth taken out of it has been spread evenly all around it in in the shape of a circular ring of width 4m to form a embankment . find the height of the embankment
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Answer:
The answer is 1.125 m.
Step-by-step explanation:
Height of the well = 14 m
Diameter of the well = 3m
So,
Radius of the well =3/2m
Volume of the earth taken out of the well πr^2h
22/7×3/2×3/2×14
=99 m^3
Outer radius of the embankment =R=3/2+4
11/2
Area of embankment =Outer -Inner
=πR^2-πr^2
=22/7×(11/2)^2-(3/2)^2
=22/7×121/4-9/4
=22/7×112/4
=88m^2
Height of the embankment =Volume/Area
99/88
=1.125m
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