The Greek letter Pi stands for a number that is infinite, and can be rounded off to 3.14--and so is celebrated on 3/14 (March 14th). This year is special, because the first 10 digits of Pi will click into place on 3-14-15 at 9:26:53
The number Pi can be used to find the measurements of a circle. The circumference of a circle equals Pi multiplied by the diameter of the circle.
In other words, the circumference is a little more than 3X the diameter.
Try it! Cut a string that's the length of the diameter (straight across the middle of a circle), and three of those (plus a little more--3.14...) go once around the edge.
There's more: you can find the area of a circle using Pi. The area is Pi multiplied by the radius squared.
A = Pi X R2
A = Pi X R X R
It works every time, with every circle. How cool is that? No doubt about it, math is fascinating and beautiful.
I created a Pi Day Medallion so kids can wear their love of math stylishly. It's so chic and geeky--in the best sense--that kids of all ages can wear it proudly.