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 ...

A data storage company has decoded more than 100 trillion digits of pi — smashing the world record for calculating the never-ending number. Unraveling this hefty slice of pi required the equivalent ...

Today is Pi Day for 2026, the universal celebration of an amazing, mysterious, and irrational mathematical constant. What's that, you say? Why do we celebrate something that shows up in some of the ...

Good morning. I'm Rachel Martin. A Google employee in Japan has made history by calculating the value of the number pi to a new record - 31 trillion digits, just a smidge beyond the 3.14 that begins ...

Celebrate Pi Day and read all about how this number pops up across math and science on our special Pi Day page. Grab something circular, like a cup, measure the distance around the circle, and divide ...

Happy Tau Day, everyone! Every June 28, a rogue fleet of math nerds makes its case for the abolition of arguably the most important irrational number in the world: pi. These men and women of the "tau" ...