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Find the cost of plastering the inner surface of the well ,with the diameter 3.5 m and depth 10 m at the rate of rupees 45 per m2



Inner surface of the well =πrh
then, inner surface of the well =2*π*3.5/2*10
Hope this will help you.
1 5 1
the base of the well needs water, and how can you plaster it also?????????
oh yeah :)
good avishek
We know that a well is in a shape of a cylinder. So to find the cost of plastering, we need to find the curved surface area of the walls first and then multiply it to the cost.

So CSA of cylinder = 2πrh 
= 22/7 x 3.5/2 x 10
= (22 x 0.5 X 10)/2
= 110 m²

Now cost = 110 x 45 
= Rs 4950

Hope that helps !!
1 5 1
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