It's National Pi Day - eat some pie - KTRE.com | Lufkin and Nacogdoches, Texas

It's National Pi Day - eat some pie

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Across the country, people are eating a delicious concoction of pie to celebrate Pi Day. (Source: Furfur/gj_on_Wiki/Wikimedia Commons) Across the country, people are eating a delicious concoction of pie to celebrate Pi Day. (Source: Furfur/gj_on_Wiki/Wikimedia Commons)

(RNN) - Pastry and math lovers rejoice - Friday is a day for you all.

National Pi Day honors the ratio of a circle's circumference to its diameter. The date, March 14, matches the first three numbers of pi: 3.14.

Princeton University even has a weeklong Pi Day party, complete with pie eating and judging contests, pi recitations and more. The celebration and the date also coincide with the birthday of inventor Albert Einstein, who did not discover pi but probably would have if nobody did it first.

The Princeton Pi Party has the only Twitter feed to celebrate the occasion, too.

Pi is used in geometry to find the area of a circle and volume of cylinders. Pie is used as a delightful treat after dinners, or in the case of chicken pot pie, for dinner.

Represented by the Greek letter Π, it has been measured in different forms throughout history. From a Biblical reference in the Old Testament to mathematician Archimedes determining what pi is, it is shown no matter the size of the circle, pi is always the same.

According to CNN, computers have calculated pi up to its 2,000,000,000,000,000th, or 2 quadrillionth, digit. At Achatz Handmade Pie Co., you can calculate how much it would cost to buy up to 44 different types of pie, if you count cheesecake and quiche.

There is a website dedicated to the celebration and passion of pi, with everything from the history to strange legal errors involving the never ending mathematical function and ways to celebrate Pi Day.

A few years ago, the 111th Congress passed House Resolution 224 to make March 14 National Pi Day. Pie remains officially unrecognized by the U.S. government.

And Pi Day 2015 will be a special one for geometry lovers everywhere. At exactly 9:26:53 a.m., Pi revelers can write out the date 3/14/15; 9:26:53 to get the first 10 digits of Pi in order.

Do you like to tweet? I do – follow me on Twitter @TanitaG_RNN.

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