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.
This year is ultimate Pi day, 3-14-15 ........
Learn more about Pi day at www.Piday.org
http://youtu.be/Vp9zLbIE8zo Watch a cool video showing the domino effect of Pi .