Number system and $\pi$ Ok, we all use the decimal system with numbers from 0 to 9. And we have $\pi$ with an infinite number of decimals.
We also have a boolean system or hexadecimal. 
Is there any decimal system where $\pi$ has an ending number of numbers?

If a number has a finite expansion, in a rational base, using rational digits, then the number is rational.  This is because the sum and product of rational numbers is rational.  
Note: Even some rational numbers have non-terminating expansions in base 10.  For example, $1/3$.
