SOLUTION: 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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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 ?
Answer by Alan3354(30959) About Me  (Show Source):
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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%2Api%2Ar%2Ah+=+2%2Api%2A0.04%2A5 sq meters
SA = 0.4*pi sq meters
Cost = 0.4*pi*14 R