Math lovers celebrate March 14 as Pi Day, in honor of the irrational number pi. Pi, or π, is defined as the ratio of the circumference of a circle to its diameter. Pi is an irrational number, meaning ...
Today is Pi Day — the day each year, March 14, that follows the first three digits of pi (3.14). And this year’s Pi Day is a special one: Since — in the U.S. — the date is represented as 3/14/15, we ...