# GK Today: World Pi Day, 14 March 2018 - Notes

World Pi Day, 14 March 2018 |

**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 has been calculated to over one 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.

**About Pi (π)**

**Pi (π) is the ratio of a circle’s circumference**to its diameter.**Pi is a constant number, meaning that for all circles of any size, Pi will be the same.**

- The diameter of a circle is the distance from edge to edge, measuring straight through the center. The circumference of a circle is the distance around.