Question

The inner diameter of a circular well is 0 .7 m and it is 27 m deep.
(a) Find the inner curved surface area of the well. ( Take π = 22/7. )
(b) Determine the cost of plastering the inner curved surface area of the well at the rate of Rs 80 per square metre.

Answer 1

Answer:

r=d/2

=7/10×2

r=7/20

h=27

a)inner curved surface area =

$2\pi \: rh$

=2×22/7×7/20×27

=11×27/5

=37.4m²

b)cost of plastering

=37.4×80

=2992₹

Step-by-step explanation:

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