Question 394641
An iron pipe having outer radius of 4 centimeter is 5 meter long. Its curved surface has to be painted. find the cost of painting it at the rate of Rs.14 per sq.meter ?
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{{{SA = 2*pi*r*h = 2*pi*0.04*5}}} sq meters
SA = 0.4*pi sq meters
Cost = 0.4*pi*14 R