a 21m deep well with diametre 6m is dug and the earth from digging is evenly spread to form a platform 27m cross times11m.find the height of the platform(use pie as 22\7)   (explain each step)

Asked by ushanihar12 | 10th 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 r2 h = l x b x h
(22/7) x (3)2 x 21 =27 x 11 x h
h = 2 m
 
Therefore, the height of platform is 2m.

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