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A circular well is dug. Its diameter is 3 1/2m and its depth is 6 m. What is the lateral surface area of the well? What is the volume of the earth removed to make the well?

Answer :

Revolution
diameter=3.5 m
r=1.75
h=6 m
lateral surface area of a cylinder=2πrh=65.97 m
volume=πr²h=57.73 m³

so 57.73 m³ soil will remove

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