SOLUTION: 1- a metalic pipe is .7cm thick inner radius of the pipe is 3.5cm and length is 5dm find its total surface area

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Question 714783: 1- a metalic pipe is .7cm thick inner radius of the pipe is 3.5cm and length is 5dm find its total surface area
Answer by Alan3354(69443) About Me  (Show Source):
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1- a metalic pipe is .7cm thick inner radius of the pipe is 3.5cm and length is 5dm find its total surface area
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The length is 50 cm
The inner radius is 3.5 cm
Area+=+2%2Api%2Ar%2Ah+=+2%2Api%2A3.5%2A50
= 350pi sq cm
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The outer radius is 4.2 cm
Area+=+2%2Api%2Ar%2Ah+=+2%2Api%2A4.2%2A50
= 420pi sq cm
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The area of each end is pi%2A%284.2%5E2+-+3.5%5E2%29+=+5.39pi sq cm
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Total area = 780.78*pi sq cm