SOLUTION: A piece of a drain pipe, right cylindrical in shape, is 3 feet long. The wall of the pipe is ¾ inch thick; the inner radius of the pipe is 8 inches. Find the outside surface area

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Question 1196989: A piece of a drain pipe, right cylindrical in shape, is 3 feet long. The wall of the pipe is ¾ inch thick; the inner radius of the pipe is 8 inches. Find the outside surface area of the pipe.
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The outside radius is 8%263%2F4++inches.

Top and bottom of the outside are two of the same size. Those much together:
2%2Api%2A%288.75-8%29%5E2
2%2A%280.75%29%5E2%2Api
1.125pi square inches.

Outer circumference:
2%2Api%2A8.75
17.5pi
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Outer wall surface area:
3%2A12%2A17.5pi sqrinches
highlight%28630pi%29sqrinches



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The length was given in feet. The factor 12 is for converting to inches.