March 14 might be best known as the annual celebration of everyone's favorite mathematical constant but it's an important day for pizza lovers, too Domino's Pizza is kicking off Pi Day by offering 50-percent off all menu-priced pizza orders placed online for a week and Pizza Hut will release three math problems on its blog Be the first person to submit the correct answer to any problem for a chance to receive 3.14 years of free pizza from Pizza Hut!
