Unfortunately the article is down at the moment, but there's a beautiful identity that suggests that maybe pi/4 is a constant of nature, not pi: pi/4 = 1 - 1/3

Unfortunately the article is down at the moment, but there's a beautiful identity that suggests that maybe pi/4 is a constant of nature, not pi: pi/4 = 1 - 1/3 + 1/5 - 1/7 + 1/9 - 1/11 ... That's arguing from pure mathematics. Judging from the comments, I think the article argues (from kind of an engineering point of view) that 2pi would be more convenient.