National Pi Day

Pi Day is celebrated on March 14th (3/14) around the world. Pi (Greek letter “π”) is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter, which is approximately 3.14159.

The area of a circle. A = πr²

Where ‘r’ is the radius (distance from the center to the edge of the circle). Also, this formula is the origin of the joke “Pies aren’t square, they’re round!”

The volume of a cylinder. V = πr²h

‘h’ is the height of the cylinder.

Marie Callender's - Free slice of pie with entrée purchase.

Blaze Pizza - All personal pizzas $3.14. 

Pizza Studio - All Pizzas $3.14. 

Papa John's - take 25 percent off their regular menu items, provided that they use the clever code "25OFF." 

Dominos - 2 medium 2 topping pizzas for $5.99 each with code "9193".

Macy's - Get 25% off online orders with code "VIP" 3/9/14 - 3/14/16.

GAP - 40% off online orders with code "GAPFAM" 3/9 - 3/14.

Polly's Pies Restaurant - Free slice of pie for eclub members, $3.14 off all whole pies.