Math, asked by jithinmanoj, 1 year ago

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

Answers

Answered by ork

inner surface of the well =πrh
d=3.5m,h=10m.
then, inner surface of the well =2*π*3.5/2*10
=110m²
1m²=Rs45
110m²=110*45
=Rs4950.
Hope this will help you.

ork: Please make mine as the best

ork: thank you

Avishek: inner surface of well also includes the base of well

ork: the base of the well needs water, and how can you plaster it also?????????

Avishek: oh yeah :)

ork: good avishek

Avishek: :)

ork: :)

Answered by 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 !!

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