4. A welf is du

1.	4. A welf is du
Answer» Diameter=4mRadius=d/2=4/2=2mDepth=10m Volume of earth taken out=πr²h=22/7×2×2×10=8800/7 m^3 Curved surface area=2πrh=2×22/7×2×10=8800/ 7m²=88000000/7 cm²Cost of plastering inner curved surface area:-For 1 cm²=Rs. 5For 88000000/7 cm²=62857142.8 rupees.

Answer»

Diameter=4mRadius=d/2=4/2=2mDepth=10m

Volume of earth taken out=πr²h=22/7×2×2×10=8800/7 m^3

Curved surface area=2πrh=2×22/7×2×10=8800/ 7m²=88000000/7 cm²Cost of plastering inner curved surface area:-For 1 cm²=Rs. 5For 88000000/7 cm²=62857142.8 rupees.

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