March 14 is celebrated as both Pi Day and Pie Day. Pi Day honors the mathematical constant π (pi), a symbol of the relationship between a circle's circumference and diameter, while Pie Day is a ...

Many people will mark the day with a slice of pie — sweet, savory or even pizza. Simply put, pi is a mathematical constant that expresses the ratio of a circle’s circumference to its diameter.

But there's another holiday that offers an even better excuse to indulge in pie: Pi Day, celebrated on March 14, is a non-traditional holiday beloved by math geeks everywhere. If you’re planning ...

If you'd like to whip up something sweet and irrationally delicious to do your part for Pi Day, I've got five of our best pie recipes for you. They range from classics (like apple pie) to seasonal ...