Pi Day of the Century marks a mathematical marvel

March 14, 2015 5:07 PM

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You probably remember pi from grade school, but here’s a quick refresher: Pi is the number that approximates the ratio of a circle’s circumference to its diameter. In other words, if you divide the circumference of any circle by its diameter, you always get pi, an irrational number that starts with 3.1415 and goes on forever. It shares its name with the 16th letter of the Greek alphabet.

The idea of celebrating Pi Day on March 14 — coincidentally, Albert Einstein’s birthday — started in the 1980s. The first large-scale celebration was organized in 1988 at the Exploratorium museum in San Francisco, and Pi Day got a boost two decades later when the U.S. House of Representatives passed...

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