When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Originally defined as the ratio between the circumference of a circle and its diameter, pi — ...

The quest for precision in pi has led to over 2.7 trillion digits calculated, but how many do we actually need? This exploration contrasts mathematicians’ obsession with engineers’ practical approach.

Friday is Pi Day, a national celebration of the mathematical concept, which is the ratio of a circle's circumference to its diameter and equals 3.14... Schools and museums often plan events to ...

Originally defined as the ratio between the circumference of a circle and its diameter, pi — written as the Greek letter π — ...