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 ...
Pi Day is celebrated every year on March 14 to honour the mathematical constant (pi). The date 3/14 matches the first three digits of the value of pi, which is approximately 3.14. The day is widely ...