# Pi Day Quiz: How many digits can you name?

For math geeks, March 14 is a delicious holiday that celebrates one famous number — pi or approximately 3.14.

The mathematical constant, which is the ratio of a circle’s circumference to its diameter, can be used to find the area or circumference of a circle — or of that *pie* you’re hopefully enjoying right now.

Designated as a U.S. holiday in 2009, National Pi Day is celebrated by everyone from elementary school students to science museums to pizza parlors.

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Because pi is an irrational number — meaning the numbers never end and never fall into a repeating pattern — Pi Day is also celebrated with pi recitation contests.

On Pi Day 2013, the math department at Harvard University held a recitation contest. The winner was able to recite pi to 224 digits.

How many decimal spots can you memorize? Try our pi tester above. Along the way you’ll find out some fun facts about the elusive number.

The post Pi Day Quiz: How many digits can you name? appeared first on PBS NewsHour.