Pi Day, celebrated on March 14, honours mathematical constant Pi, recognising its significance in mathematics, particularly ...

When is National Pi Day 2025? What to know about Pi Day activities for kids, songs, movies, jokes, deals, snack ideas and more.

March 14 is celebrated as both Pi Day and Pie Day. Pi Day honors the mathematical constant π (pi), a symbol of the relat ...

Simply put, pi is a mathematical constant that expresses the ratio of a circle’s circumference to its diameter. It figures into numerous formulas used in physics, astronomy, engineering and other ...