Question

The inner diameter of a circular well is 3.5 m. It is 10 m deep Find:

(i) inner curved surface area.

(ii) the cost of plastering this curved surface at the rate of Rs 40 per m².

Answer 1

Given data is as follows:

Inner diameter of the well = 3.5 m

h = 10 m

Rate of plastering = Rs.40 per square meter

We have to find two things,

1. Inner curved surface area

2. Total cost of plastering the inner curved surface

(i)

Inner curved surface area = 110

(ii) Now, let us find the total cost of plastering this area.

It is given that for 1the cost of plastering is Rs.40

Therefore, for 110 the cost of plastering =

= 4400

Cost of plastering = Rs 4400