Celebrate Pi Day and read about how this number pops up across math and science on our special Pi Day page. For more than two millennia, mathematicians have produced a growing heap of pi equations in ...

Most of us first hear about the irrational number π (pi)—rounded off as 3.14, with an infinite number of decimal digits—in school, where we learn about its use in the context of a circle. More ...

March 14 is no regular Pi Day this year. Math enthusiasts everywhere are celebrating the event as Ultimate Pi Day, because the date will correspond to the first five digits of pi (3.1415) rather than ...

Student mathematicians spent Saturday crunching numbers and solving equations at Maria Carrillo High School’s library as part of an academic tournament celebrating Pi Day, March 14. About 50 ...