How many cubic metres of earth must be dug out to sink a well which is 20 m deep and has a diameter of 7 metres?
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Amount of Earth dug out= Volume of well
= πr^2h
= 22/7 * 3.5 * 3.5 * 20
=770m^3
= πr^2h
= 22/7 * 3.5 * 3.5 * 20
=770m^3
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