How many metres of earth must be dug to dig a well 32 m deep with diameter 7 m? Find the cost of
plastering its inner surface at 4.5 per m2
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question is »»»»»
How many metres of earth must be dug to dig a well 32 m deep with diameter 7 m? Find the cost of
plastering its inner surface at 4.5 per m2
Given»»»»»»
Radius = diameter /2=7/2 m
height =32m
Solution »»»»»»
and so volume of cylinder = πr^2h
= 22/7×7/2×7/7×32
=1232 m^3
there would be dig 1232m^3 earth for dugging
Cost of plastering inner side as the rate of ₹4.5/m^2
Curved surface area if cylinder = 2πrh
=2×22/7/7/2×32
=704 m^2
=704×4.5
=₹3168
hope this will help you............... OK
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