A 20 metre deep well with diameter 7 metre is dug and the earth from digging is evenly spread out to form a platform 22m * 14m find the height of the platform
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Step-by-step explanation:
Volume of circular well = πr^2h = 22/7 x 7/2 x 7/2 x 20
= 22x7x7x20/ 7x2x2 = 770 cubic metres
Volume of platform = amount of earth = 770 cubic metres
Volume of platform = volume of cuboid = l x b x h
770 = 22 x 14 x h
770/22 x 14 = h
770/308 = h
2.5 m = h
The height is 2.5 m
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