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Mathematics 3 Online
OpenStudy (anonymous):

A Hollow piece of cylindrical pipe has an outside radius of 1.9 inches and an inside radius of 1.8 inches. The pipe is 4 feet long. How many square inches are in the total surface area of the pipe? I don't quite understand the part " outside radius of 1.9 inches and an inside radius of 1.8 inches." how would it look like? Can someone verify it, please?

OpenStudy (angela210793):

is it smth like this? use r1=1.9 and r2=1.8|dw:1331407520375:dw|

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