Question

Question 3 - The inner diameter of a
circular well is 3.5 m. It is 5 m deep.
Find (i) its inner curved surface area,
(ii) the cost of plastering this curved
surface at the rate of Rs. 40 per meter
square.​

Answer 1

Answer:

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.