As a side note: > and by the third century Chinese mathematician Liu Hui and the fifth century Indian mathematician Aryabhata, both of whom found pi to at leas

As a side note: > and by the third century Chinese mathematician Liu Hui and the fifth century Indian mathematician Aryabhata, both of whom found pi to at least four digit accuracy. Zu Chongzhi should also be mentioned: https://en.wikipedia.org/wiki/Zu_Chongzhi https://en.wikipedia.org/wiki/Zu_Chongzhi The simple fraction 355/113, or Milü: https://en.wikipedia.org/wiki/Milü https://en.wikipedia.org/wiki/Milü which is very easy to rememember (the first three odd numbers repeated twice) and gives in its simplicity an excellent approximation. On Windows Calc: 355/113-pi=2,6676418906242231236893288649633e-7