A well is dug 20m deep and it has a diameter 7m. The earth which is so dug out is spread evenly on a rectangular plot 22m long and 14m broad. What is the height of the platform so formed?
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Diameter = 7 m
so, radius = 3.5 m
H = 20 m
Volume of the earth dug out = π r² h
= 22/7 × 3.5 × 3.5 × 20
= 770 m³
Area of the platform = Length × breadth
⇒ 22 × 14 = 308 m²
Height of the platform = Volume of the earth dug out/area of the platform
⇒ 770/308
''Height of the platform = 2.5 m Answer.''
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