Both Pi and Tau are irrational (what you call "infinite", http://en.wikipedia.org/wiki/Irrational_number http://en.wikipedia.org/wiki/Irrational_number) and tra

Both Pi and Tau are irrational (what you call "infinite", http://en.wikipedia.org/wiki/Irrational_number http://en.wikipedia.org/wiki/Irrational_number) and trascendental (http://en.wikipedia.org/wiki/Transcendental_number http://en.wikipedia.org/wiki/Transcendental_number). They are also believed to be normal (http://en.wikipedia.org/wiki/Normal_number http://en.wikipedia.org/wiki/Normal_number), but there is no proof of this.