A Belated Happy Pi Day!

I forgot to wish everyone a Happy Pi Day yesterday, so have a belated Happy Pi Day! 
Why Pi Day?  See the first million digits of pi here:  One Million Digits of Pi

Pi represents the relationship between a circle’s diameter (its width) and its circumference (the distance around the circle).

Picture from: http://www.piday.org/learn.php

Equations that use Pi

       Area of a Circle

     Volume of a Cylinder

Check out these fun activities, all centered around Pi:

Make Music with the Digits of Pi

Search Pi for your phone number or birth date

Pi Art