The diameter of a well is 2.1m and it is 1.4 m deep . Find the cost of plastering it at Rs.5 per square m .
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Step-by-step explanation:
Given
Diameter (d)=2.1m
Deapth i.e height=1.4m
cost per square m=5Rs
radius=1.05
To find the total surface area of well,
Surface area of cone =pie*r*h
=22/7*1.05*1.4
=4.62
...Therefore the surface area of well is 4.62 sqm.
Now ,
To find the cost for plastering the well,
Total cost=surface area of well*cost per sqm
=4.62*5
=23.1 m
.Therefore the cost required to plaster the well is 23.1 Rs.
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