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Happy National Pi Day! In celebration of pi, the ratio of a circle’s circumference to its diameter, March 14 (3.14…get it?) was deemed National Pi Day in 2009. People celebrate National Pi Day with mathematics, circular pastries, even pizza (not that we need an excuse to eat pie and pizza). Once you figure out where you’ll be getting your celebratory pie from, take a look at why next year’s Pi Day will thrill math geeks, why some say pi needs a makeover and an ode to pi through jokes.

How America celebrates Pi Day
— CNN

On Pi Day, backers of tau say the ‘circle constant’ needs a makeover
— Los Angeles Times

March 14, 2015 will be a once-in-a-century thrill for math geeks
— Business Insider

Pi day in Chicago: Map of where to celebrate with deals on pie
— DNAinfo

An ode to pi on Pi Day — best pi jokes
— Business 2 Community