Subject: Why is pi an irrational number?

I'm not asking for a proof that pi is an irrational number.  One way to
interpret the fact that pi is an irrational number is to say that there
is no exact relationship between a circle's diameter and circumference.
You can estimate it as accurately as you like, but you can never know it
exactly.  Does anyone know or even have a theory as to why this is the
case?

PS: I would have chosen "Math" as the area of science, but it isn't an
option.

Thanks!

Eric Osman

Re: Why is pi an irrational number?