How many cubic metres of earth must be dug out to sink a well 22.5 m Deep and of diameter 7 m? also find the cost of clustering the inner curved surface at Rest. 3 per square metre
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H=22.5m
Diameter=7m
Radius=Diameter/2=7/2
volume of well(cylinder)=volume of earth dug out
πr²h=volume of earth dug out
22/7×7/2×7/2×22.5
=11×7/2×22.5
volume of earth dug out=866.25m³
clustering inner curved surface area=curve surface area of cylinder=2πrh
2×22/7×7/2×22.5
22×22.5
495m²
cost=area×rate
=495×3
1485 Rs
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