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pi*D

So pi*15 here.

If you've a scientific calculator (or set the calculator probably in your computer in "Accessories" somewhere, to 'Scientific'), it will have a pi key.

But do you mean the circumference of the 15" dimension or is that pipe bore but you want the outside circumference? If the latter you'd need its outside diameter - there will be an appreciable difference!

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Q: What is the circumference of 15 inch pipe to the nearest tenth?
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The answer depends on what the "36 inch" measures: inside circumference, radius, diameter?


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