Question

the inner diameter of a circular well 4.2m.it is 12 m deep find the cost of plastering the inner cubes surface at the rate of ₹50per square
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Answer 1

Step-by-step explanation:

Given:

⇒(i)r= radius=

2

3.5

=1.75 , h= depth of the well=10m

⇒Curved surface area

=2πrh

=(2×

7

22

×1.75×10)m

2

=110m

2

⇒(ii) Cost of plastering = Rs 40 per m

2

The cost of plastering the curved surface = Rs (110×40)= Rs 4400.