Students of math, it’s time for your favorite holiday—National Pi Day. Yes, we’re talking the number Pi, that ratio of the circumference of a circle to its diameter. And we’re talking pie—a slice of your favorite flavor. Every March 14—that’s 3/14 for math students around the globe—the Pi symbol becomes a reason to delve into a pie—for research, of course, jokes John Fulk, Georgia Perimeter College math professor. “National Pi Day is one of the only math holidays we can have,” he says. “Even small kids will say they like Pi.” More than just 3/14, Pi actually stretches beyond infinity. Students entering the GPC Clarkston Campus math department can see Pi played out in more than 300 numbers painted along the wall, beginning near Fulk’s office. Fulk has memorized 90 digits of Pi—a trick he learned while in high school. “Yes, I was bored, and I just memorized them for something to do,” he says. (So far, mathematicians have calculated Pi to more than one trillion digits beyond its decimal point). Fulk still loves figuring out Pi and enjoys showing his calculus students how to use the number in their calculations. “Our students learn how Pi is used: you can take any circle and wrap a string around its radius and it comes up 3.14 times—this works no matter how large or how small the circle is,” he says. Students of trigonometry and calculus are more likely to use Pi in their calculations. “You can also use Pi with calculating sound waves, light waves—anything that involves waves,” Fulk says. This year National Pi day arrived during GPC’s spring break. What’s a Pi lover to do? Serve pie on the Monday following the break, which happens to be another holiday—St. Patrick’s Day, 3/17. “I guess we’ll be serving key lime pie,” Fulk says.