March 14th was Pi Day. <br>It's the circumference over diameter. <br>Learn about Pi<br> <br>Pi (u03C0) is the ratio of a circleu2019s circumference to its diameter. Pi is a constant number, meaning that for all circles of any size, Pi will be the same.<br>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.
