🥧

 Today is my birthday. Have a piece of Pi!

 My love to all, but especially to the one I 

❤

Love!

TEACHER RESOURCES

PI DAY COLORING PAGES

Pi day logo horizontal

Countdown to Pi Day!

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Learn About Pi

What is Pi?

Celebrate Pi

Pi Merch, Decor & More

Math Help

Tutorials & Videos

Calculators

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Teacher Resources

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Explaining what pi is

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.

Pi has been calculated to over 50 trillion digits beyond its decimal point. As an irrational and transcendental number, it will continue infinitely without repetition or pattern. While only a handful of digits are needed for typical calculations, pi’s infinite nature makes it a fun challenge to memorize, and to computationally calculate more and more digits