mihai34 Posted March 13, 2019 Report Share Posted March 13, 2019 Celebrate Pi Day March 14 with $3.14 pizza, free pie and more USA TODAYIt's not irrational to find pizzas for $3.14 Thursday. March 14 is Pi Day, an annual celebration of the mathematical constant π (pi), which is the ratio of a circle's ... View the full article Quote Link to comment Share on other sites More sharing options...