The famous mathematical ratio, estimated to more than 22 trillion digits (and counting), is the perfect symbol for our species’ long effort to tame infinity. By Steven Strogatz This article, ...

Pi Day is an annual event in March (3/14) that celebrates pi, the mathematical symbol for the ratio of the circumference of a circle to its diameter. Physicists in San Francisco first celebrated Pi ...

Pi, a mathematical constant denoted by the Greek letter π, is the ratio of a circle's circumference C to its diameter d: π = C/d. The circumference of a circle is, in turn, equal to 2πr, where r is ...

In geometry, pi is the ratio of a circle’s circumference to its diameter. It’s the number 3.14, approximately, and it’s a fascinating mathematical concept. On Pi Day last Thursday — March 14, or 3-14 ...