Question

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​

Answer 1

HERE'S YOUR ANSWER

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