Roh Odpovědná osoba kyselý is pi irrational Faktura Aktualizace Prostěradlo
Pi is IRRATIONAL: animation of a gorgeous proof - YouTube
The International Science Fiction Society - What did the "i" (imaginary and complex number) tell "pi" (irrational number, also the ratio of a...) ? Yeah, just not gonna try with this one. | Facebook
Proving π is irrational using high school level calculus - YouTube
9 random facts about pi (the irrational number, not the food) | wfaa.com