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Question

How many cubic metres of Earth must be dug to construct a well 14 m deep and of diameter 1.8 m?
[2 marks]

A
64.12 m3
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B
40 m3
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C
44 m3
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D
35.64 m3
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Solution

The correct option is D 35.64 m3
Given, height (h) =14 m
Diameter =1.8 m
So, radius (r) =1.82 m =0.9 m
[0.5 mark]

Volume of a cylinder =πr2h
[0.5 mark]

So, volume of earth to be dug =227×0.9 m×0.9 m×14 m
=35.64 m3
[1 mark]

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