A well is dug whose diameter is 4 metre and the depth is 100 M find the quantity of earth taken out calculate the cost of plastering the curved surface at rupees 500 per square metre
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it's in cylindrical shape
volume of cylinder = quantity of earth taken out
radius = 2m
height = 10m (as per figure)
Vol = πr^2h
= 3.14 × 2 × 2 × 10
= 6.28 × 2 × 10
= 12.56 × 10
= 125.6 m^3
CSA = 2πrh
= 2 × 3.14 × 2 × 10
= 6.28 × 2 × 10
= 12.56 × 10
= 125.6 sq m
cost of plastering Rs 500 per sq m
= 125.6 × 500
= 62800 Rs
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