# ICSE Class 10 Answered

**a 21m deep well with diametre 6m is dug and the earth from digging is evenly spread to form a platform 27m 11m.find the height of the platform(use pie as 22\7) (explain each step)**

Asked by ushanihar12 | 10 Feb, 2019, 01:53: PM

Expert Answer

If 21m deep well with diametre 6m (radius 3m) is dug and the earth from digging is evenly spread to form a platform 27m x 11m.

This means that the volume of mud digged is equal to the volume of mud used to build the platform (in cuboid shape)

Volume of cylinder = volume of cuboid platform

π r

^{2}h = l x b x h(22/7) x (3)

^{2}x 21 =27 x 11 x hh = 2 m

Therefore, the height of platform is 2m.

Answered by Science Mate | 10 Feb, 2019, 05:39: PM

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