Saturday’s Google Doodle shows how the mathematical constant pi is useful for easily calculating the area of a circle, the formula for which is A=πr2. Image courtesy Google

March 14 (UPI) — Saturday’s Google Doodle celebrates everyone’s favorite math holiday, Pi Day.

The Doodle features an animated illustration of how the mathematical constant is used in equations dealing with a circle’s circumference and diameter.

“Long before modern technology, the Greek mathematician Archimedes popularized an innovative approach: He approximated the value of pi by sandwiching a circle between two 96-sided polygons to determine its precise upper and lower bounds,” a Google post about the Doodle reads.

“Today, we honor this mathematical legacy as enthusiasts worldwide celebrate with pi-reciting contests and slices of pie.”

The value of pi is roughly 3.14, but since it’s irrational, the number of decimal places beyond .14 go on infinitely. There are contests worldwide in which math lovers memorize and recite as many digits of pi as possible.

Last Pi Day, in 2025, a 10-year-old British boy recited 280 digits of pi from memory in 1 minute, breaking a Guinness World Record.

Pi Day is celebrated March 14 each year because the date is typically expressed as 3/14. Those less interested in math often choose to celebrate the day by eating a slice of their favorite pie.