Question 52367
Pi ( ratio of the circumfrenece ) is not a complex number. But it is a real number which an ever exist. the only problem is it can  not be defined to a precise decimal. It is an irrational number. Like 
{{{sqrt(2)}}}

╥ =3.14159 26535 89793 23846 26433 83279 50288 41971 69399 37510 (up to 50 decimals) ╥ can not be expressed as a fraction.