"You take pi, which is 3.14, and multiply it by your pie's diameter," Cook said, noting that most pies are 8 inches in diameter. "Then you divide the number by the number of slices that you'd like.

Slice into a piece of Pi! Pie, math enthusiasts celebrate 3.14 02:06. BALTIMORE - Pi Day is the most mathematically delicious day of the year. March 14 -- it's 3.14, which celebrates the number ...