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Happy Pi Day: top ten uses of Pi

Today is March 14, Pi Day, celebrating the mysterious ratio of a circle’s circumference to its diameter.  The number is irrational, so there is no end to its number of digits.  Go to 3.141592653589793238462643383279502884197169399375105820974944592.com (or here) for Pi to a million digits.  Or just listen to this Pi rap.

In celebration of Pi Day, here are ten uses of Pi having nothing to do with math:

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