Larry Shaw made pi day on 3, 14, 1989.
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Divide 314 by pi and square root the answer which will give you the radius.
Pi Day is March 14th because the first thee digits of pi are 3.14
Pi Day can be celebrated by eating a pie, discussing topics related to pi, dressing in pi-ralated apparel, such as a shirt with the pi symbol on it, or doing anything else related to pi.
The next pi day is on Saturday. Which is March 14, 2009.
Pi day