March 14th is Pi Day, so enjoy some pie!

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Today is March 14th, otherwise know as National Pi Day! It's an annual celebration of the mathematical constant, π.

In math, pi (π) represents the mathematical ratio of a circle's circumference to its diameter. Because it is an irrational number, it has an infinite number of decimals, but it's most often noted as 3.14 -- its first three digits. If you were curious, the National Pi Day official website has expanded it to a million places.

But many observe the day with a different sort of circle,  in the form of pie, or pizza. Several places that serve both even offer deals!

Here's a list of some places with Pi Day promotions. Keep in mind, offers can vary by location.

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