# Day 6 | LThMath Advent Calendar

In today's post I wanted to share a little creative way of showing some digits of Pi. I believe it is one of the most interesting mathematical constants.

__General Definition__

The number π is a mathematical constant. It is defined in Euclidean geometry as the ratio of a circle's circumference to its diameter, and also has various equivalent definitions. The number appears in many formulas in all areas of mathematics and physics. The earliest known use of the Greek letter π to represent the ratio of a circle's circumference to its diameter was by Welsh mathematician William Jones in 1706. It is also referred to as Archimedes' constant.

*π* is commonly defined as the ratio of a circle's circumference *C* to its diameter *d*:

*π = C / d*

A little bit of self promotion in here, I have used this design to create a little design that you can add to different items, such as T-shirts, hoddies, mugs, tote bags and a little sticker. If you enjoy the design, take a look at our __Teespring shop__.