Question

Diameter of a well is 2.1m and 14m deep find the cost of plastering it at ₹5 per sq. m.
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Answer 1

Answer:

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Step-by-step explanation:

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Given -

diameter = 2.1m

radius = 1.05m

let the height be the deep of the well.

TSA=2πr(h+r)

=  2×22/7×1.05(14+1.05)

=  46.2/7×15.05

=  695.31/7

=  99.33m²

cost of plastering = 5 × 99.33

                              = ₹496.65     (answer)