How many cubic metre of earth must be dug out of sink a well of 22.5m deep and diameter 7m? Also,find the cost of plastering the inner curved surface at ₹3 per square metre.
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Answer:
3465m³, ₹2970
Step-by-step explanation:
Height of the well = 22.5m
Diameter of the well = 7m
Volume of the well = Cubic meters which is to be dug of to create this well = πr²h
= π (7)²(22.5)
= 22/7 × 7 × 7 × 22.5
= 22 × 7 × 22.5 = 3465m³
CSA of the well = 2πrh = 2π(7)(22.5)
= 2 × 22/7 × 7 × 22.5
= 2 × 22 × 22.5
= 990m²
Cost of plastering the inner curved surface = CSA of well × 3 = 990 × 3 = ₹2970
Hopefully
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