March 14 is National Pi Day, the annual celebration of the mathematical ratio of a circle’s circumference to its diameter (3.14), and you can score some related deals.

March 14 (3/14) is the day we celebrate the mathematical constant pi — 3.14. In honor of the holiday, restaurants across the country offer deals and freebies on pizza and pie.

Happy Pi Day! Today (Thursday) is March 14, also known as 3/14, so it’s Pi Day -- a math-inspired pseudo holiday named after the irrational number. What is Pi? If it’s been a while since you ...