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Have a piece of pie for National Pi Day


It’s a holiday for math teachers: March 14 = 3.14 = Pi Day, named after the mathematical constant that is the ratio of a Euclidean circle’s circumference to its diameter. On Pi Day, we celebrate mathematics and things that are round — but instead of rounding up for pi, students relish every digit. Here’s how you can celebrate, even after you’ve graduated.

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