a well with 10m diameter is dug 14m deep. Earth taken out of it is spread all around to make a platform of length 20m and width of 10m. Find the height of the platform
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Well with 10m diameter is dug 14m deep.
⇒ Cylindrical radius =
2
10
=5m
Volume =πr
2
h
=
7
22
×5×5×14
=1100 cubic meter
Is taken out and spread width of 5m.
( diagram )
⇒R
1
=5+5=10m
r=5m
⇒V=π(R 2−r 2 )h
1100= 722
(10 2 −5 2)h
350=(100−25)h
h= 75
350= 314
⇒h=4.66m
Hence, the answer is 4.66m
HOPE IT HELPS
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