it's PI and it equals 3.14159
http://wiki.answers.com/Q/What+is+the+math+term+pi...

Pi equals 3.14159265. By definition, pi is the ratio of the circumference of a circle to
http://www.chacha.com/question/whatdoespieequal...

1. There will always be debates about equal quality of the five pieces. Consider both quality and quantity when pondering how to cut a pie into five equal pieces. At least theoretically
http://www.ehow.com/how_8167420_dividepieequally...
