Pi Day is Friday, March 14. The relatively new holiday is a celebration of the mathematical calculation pi, or the infinite number representing the constant ratio of a circle’s circumference to its ...

Pi Day, celebrated on March 14 each year, honors the mathematical constant π with plenty of deals on sweet and savory pies, ...

You don’t have to remember middle school geometry to take advantage of $3.14 slices of pizza or pie on March 14.