Happy Pi Day! March 14 is celebrated in different ways in cities across the country. Pi, or 3.14, is the ratio of a circle's circumference to its diameter, and has been calculated to over one trillion digits. It was named for the Greek letter Pi, which corresponds with the letter ‘P’ which stands for the perimeter of the circle. Pi is an irrational number whose decimals continue infinitely, but it is also a delicious dessert. Listen to hear more about celebrating Pi Day.
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