March 14 Is Pi Day

Slate (excerpt) – March 13, 2013

Some people spend a lifetime calculating π. Ludolph van Ceulen did, and got it to a 35 decimals, 3.14159265358979323846264338327950288. But that was in the 17th century when calculations were always cleverly, yet excruciatingly, done by hand.Today—at this most momentous Pi Day—π has been calculated to 10 trillion decimal places.

While 3.14 is admittedly rough,
For most of us it’s close enough.

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