March 14: Pi Day

Pi Day

March 14 is Pi Day. This yearly celebration commentates the mathematics constant π (pi), the ratio of the circumference of a circle to its diameter. In US digit format, March 14 is 3/14. The first three digits of pi are 3.14.

The earliest known celebration was organized by Larry Shaw in 1988 at the San Francisco Exploratorium. The Exploratorium continues to hold celebrations. On March 12, 2009, the US House of Representatives passed a non-binding resolution (HRES 224) recognizing March 14, 2009, as National Pi Day.

To celebrate many people eat pie, try to see how many digits of pie they can memorize, and wear Pi buttons and clothing.

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