It’s the most wonderful time of the year—for mathematicians, anyway. Pi Day is Thursday, March 14. The relatively new holiday is a celebration of the mathematical calculation pi, or the infinite ...

It’s the most wonderful time of the year—for mathematicians, anyway. Pi Day is Saturday, March 14. The relatively new holiday is a celebration of the mathematical calculation pi, or the infinite ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Today is Pi Day, an annual celebration of the famous mathematical ...

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 ...