A well is dug whose diameter is 4 m and the depthis 10 m. Find the qua

1.	A well is dug whose diameter is 4 m and the depthis 10 m. Find the quantity of earth taken out?Calculate the cost of plastering the curved (inner)surface at R 5.00 per sqm.
Answer» Diameter=4mRadius=d/2=4/2=2mDepth=10m Volume of earth taken out =πr²h=22/7×2×2×10=8800/7 m³ Curved surface area=2πrh=2×22/7×2×10=8800/ 7m²=88000000/7 cm² Cost of plastering inner curved surface area:-For 1 cm²=Rs. 5For 88000000/7 cm²=62857142.8 rupees.

A well is dug whose diameter is 4 m and the depthis 10 m. Find the quantity of earth taken out?Calculate the cost of plastering the curved (inner)surface at R 5.00 per sqm.

Answer»

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

Volume of earth taken out =πr²h=22/7×2×2×10=8800/7 m³

Curved surface area=2πrh=2×22/7×2×10=8800/ 7m²=88000000/7 cm²

Cost of plastering inner curved surface area:-For 1 cm²=Rs. 5For 88000000/7 cm²=62857142.8 rupees.