This 3.14 Kilometer (1.95 mile) downtown Durham run is hosted by Scratch Bakery and Precision Race and benefits Durham Habitat. All finishers will receive a Crostada (personal pie/tart)! 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. Pi Day, celebrated around the world, is not just for math geeks anymore. It is now PIE Day for foodies, runners, walkers, AND math geeks alike! Learn more and register here. Sign up to volunteer here.