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Math lovers and pie lovers alike will find reasons to celebrate Pi Day on Monday when the calendar reads 3/14. Pi Day celebrates Pi, the infinite and irrational ratio of a circle’s circumference to its diameter. Here are some fun facts about Pi that you may not have learned in geometry.

  • Many acknowledge Pi day with pie! Some participate in pie-eating contents, while others bake pies (sometimes in the shape of the symbol Pi!).
  • Pi has been fascinating mathematicians since the 26th century B.C. Since then, people have been calculating Pi to as many decimal places as possible – currently, it has been calculated to over 13 trillion digits.
  • Pi is represented by the Greek letter “p,” or “π,” which was chosen in 1706 for the word “perimeter.”
  • To celebrate Pi Day, contests are often held to see who can recite the most digits of Pi from memory. The current record-holder is Akira Haraguchi of Japan. In 2006 he recited 100,000 digits of Pi, which took him sixteen and a half hours.
  • The National Institutes of Health, located just outside of Washington, D.C., are hosting events on Pi Day that celebrate the intersection of math and biomedical science. has more information on Pi, Pi Day, and unique ways to celebrate.