If it just 3.14 than it goes like this
3.14*5= 15.7*15.7=246.49
If it is the pi symbol than it goes like this
3.141592653589793*5= 15.707963267948966*15.707963267948966=246.74011002723395
Most likely your teacher would likely want you to round so try the first answer i gave u.
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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
(2 * 3)^2 *5=180 but 2*(3)^2 *5=90
3.141592654 * 5 = 15.70796327
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.