A well 14 m inside diameter is dug 15 m deep. Earth taken out is spread all around to a width of 7 m to form an embankment. Find the height of the embankment.
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1
r=7m
h=15m
Volume of mud =πr
2
h
=
7
22
×7×7×15
=2310m
3
Area of ring =π[14
2
−7
2
]
⇒π(14+7)(14−7)
⇒14+π
Height =
Areaofring
volumeofmud
=
147π
2310
=5m.
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