How many cubic metres earth must be dug out to sink a well of 7 m deep and 7 m in diameter?
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Wells are cylindrical in shape, so, we will be using the formula for volume of cylinder.
Diameter of well = 7m
Radius of well (r) = 3.5m
Height of well (h) = 7m
Amount of earth required = Volume of the well = πr²h
= 22/7×(3.5)²×7
= 22/7×3.5×3.5×7
= 22×3.5×3.5
= 269.5 m³
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