Happy Pi Day Everyone!!!

[getyourwings5]

"Secant, Tangent, Cosine, Sine, 3.14159!"

How come they always say "πr 2," when they are actually round?

http://pi.ytmnd.com/

http://en.wikipedia.org/wiki/Pi

http://www.piday.org/

http://video.google.com/videoplay?docid=924236369691897191&q=pi&hl=en