Question

The inner diameter of a cylindrical pit is 14m and its depth is 5 m. Find the cost of plastering the inner surface area (including the bottom of the pit) at the rate of Rs 20 per m2. ​

Answer 1

Answer:

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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.