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Why Do We Celebrate National Pi Day 1

I suspect many people will wonder about the existence of this holiday. We celebrate National Pi Day because it’s a fun way to honor the mathematical constant π (pi). Pi is used in geometry to calculate the circumference and area of circles, and it also shows up in many other areas of math and science. 

March 14th (3/14) matches the first few digits of pi (3.14), so people chose this day to celebrate. It’s a chance to appreciate math, have fun, and maybe even enjoy a slice of pie!