3.141592654 * 5 = 15.70796327
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Circumference is 2 times pi times radius, so the circumference of this circle is 2 times pi times 5, or 10 times pi. If a decimal answer is needed, pi is approximately 3.14, so C=31.4
it is impossible to know because no one has been able to find the last digit of pi yet 5 times pi is 15.708 to 3 decimal places.
I don't think there is such thing as 5 pied. Unless you mean "5 times pi", then the answer is yes. 'PI' and any multiple of it are irrational numbers.
When you multiply 12.8 times pi the exact answer is12.8 Pi, but you can round off the answer to40.192because pi is about equal to 3.14.
pi times radius or diameter equals are of a cirlce