Question

The inner diameter of a cylindrical vessel is 3.5 cm. It is 100m deep. Find the cost of polishing the inner curved surface area at the rate of ₹20 per m find the radius of the base

Answer 1

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Answer 2

Step-by-step explanation:

⇒(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.