PI PERPLEXITY

http://news.discovery.com/history/us-history/pi-day-facts-about-todays-math-holiday-160314.htm?utm_source=newsletter&utm_medium=email&utm_campaign=dnewsnewsletter If the value PI, being infinite, irrational, and non-repeating, is a geometric and mathematical "constant," simulating the relation of a circle's circumference to its diameter, what then is a finite, rational, discrete integer like 3? "variable?"