Yes, but you can have "minus pi", of course, and that's negative.
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YES! the number pi is endless
(pi) itself is an irrational number. The only multiples of it that can be rational are (pi) x (a rational number/pi) .
Pi is irrational.
None, the Number Pi is nothing to do with seconds (time).
A negative number. A positive number x a positive number = a positive number A negative number x a negative number = a positive number A positive number x a negative number = a negative Hope this helps :D