Pi Day is a day devoted to celebrating pi, the irrational number (approximately 3.14) that results from dividing the length of the circumference of a circle by the length of its diameter. Pi Day is a lighthearted celebration that’s just a bit of geeky fun. It’s based on the date of the day. Speaking of which ... When is Pi Day? Pi Day is always observed on March 14. This date came to be called Pi Day because when it is written in the month/day format—as 3/14 or 3.14—it’s the same as the first three digits of pi.

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