Whether you are a mathematician or not, the appropriate way to celebrate Pi Day is eating pie! Or maybe wearing a funny Pi shirt. Pi Day is always March 14, because pi is 3.14. I’m sure there will be an even bigger (and nerdier) celebration in 2015. Just think: 3.14.15!

As I’m *sure* we all remember from high school math class, pi is a mathematical concept that describes the ratio of a circle’s circumference to its diameter. It is also an irrational number and a fraction that never ends, but the short approximation is 3.1415 … and it just keeps on going from there.

Warning: Pi is Irrational by mudgestudios

HAPPY PI DAY!!! by arnoldzpygmypuff

Peace, Love, Pi by jjennings0424

Come to the nerd side we have pi by Ricaso_Graphics

You Want A Piece of This? by BunnyBoiler

Pi Number Drawing by Ars_Brevis

Property of Pi University by magarmor

Pi Number Design by Ars_Brevis

Pi Number Design by Ars_Brevis

Awesome Pi Symbol by PiintheSky

Easy as Pi (green) by zookyshirts

Proof that Pi is Irrational by PiintheSky

Pi rate Pirate Pi Day Shirts and Gifts by mudgestudios

See more Pi Day T-Shirts! *Remember if you click on any t-shirt, you can choose the style, color, and size you want, for infants to adults – or choose this design on lots of other gift items too!*

Happy Pi Day to you! I love the Q-T-Pi shirt!