A hollow cylindrical pipe has inner circumference 44cm and outer 45 cm. Find the cost of painting it from both sides at Rs2 per m2, if its length is 3.5m.

Answers (1)
S safeer

CSA=2\pi rh

Total curved surface area 

=2\pi\times 0.45\times3.5+2\pi\times 0.44\times3.5=19.57m^2

Cost of painting per m2 is 2 rupees

The total cost of painting = 19.57\times2=39.14

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