Pi Day isn't just about showing off how many numbers you have memorized; restaurants offer deals and discounts on pizza on Friday, March 14. Pi Day occurs on March 14, because the date is ...

From schoolkids learning about constant numbers to pizza deals to school serious math equations, here’s a slice of Pi Day fun ...

Pi, which is the ratio of a circle's circumference to its diameter, is celebrated with its own holiday on March 14.

But come March 14, it is all about paying due to perfect pies, for that is Pi Day. The date tells the tale: It's 3/14, or ...