Because pi is 3.14 and March 14 can be written 3/14 or 3.14.
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Because when you round off pi to the nearest hundredth, you get 3.14 .
March 14th is 3/14. pi=~3.14
The next pi day is on Saturday. Which is March 14, 2009.
It is PI day
Pi Day is March 14th because the first thee digits of pi are 3.14