your obligatory Pi Day post

The history of π here. Perhaps most interesting to me was the East Asian contribution to π:

In Fifth Century A.D. China, the mathematician Tsu Chung-Chi established that 3.1415926 < pi < 3.1415927[,] an accuracy that was not attained in Europe until the 16th Century. The Chinese, like Archimedes[,] could calculate pi to any degree of accuracy desired.

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