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Question

How many cubic metres of earth must be dug out to make a well 28 m deep and 2.8 m in diameter ? Also, find the cost of plastering its inner surface at Rs. 4.50 per sq.metre.

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Solution

H=28m;
r=1.4m;

earth dug out=volume of cylinder= 227×r×r×h;
= 227×1.4×1.4×28
=172.48m3
hence 172.48m3 of earth is dug out

The curved surface area of the cylinder
=2×227×1.4×28
=246.4m2

Cost of plastering= 4.50×246.4
=Rs 1108.8


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