CBSE Class 8 Answered
A 20 m deep well with diameter 7 m is dug and the earth from digging is evenly spread out to form a platform 22 m by 14 m. Find the height of the platform.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
Expert Answer
The shape of well will be cylindrical.
Depth (h) of well = 20m
Radius (r) of circular end of well = 
Area of platform = length x breadth = 22 x 14 m2
Volume of earth dug from well will be equal to the volume of earth scattered on platform.
Volume of earth from well = volume of earth used to make such platform
\ Height of platform = 2.5 m
Answered by | 04 Jun, 2014, 03:23: PM
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