Pi Day is celebrated on March 14th (3/14) around the world
Pi (Greek letter “π”) is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159
Pi Day is an annual opportunity for math enthusiasts to recite the infinite digits of Pi, talk to their friends about math, and eat pie.
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Pi Day is most frequently observed on March 14, but related celebrations have been held on alternative dates.
Pi Approximation Day is observed on July 22 (22/7 in the day/month format), since the fraction 22⁄7 is a common approximation of π, which is accurate to two decimal places and dates from Archimedes.
Two Pi Day, also known as Tau Day for the mathematical constant Tau, which is approximated as 6.28, is observed on June 28 (6/28 in the month/day format)
Pi Approximation Day is also observed on the 10th of November since it is the 314th day of the year