It’s deliciously reliable, like cherry pie: Divide the circumference of any circle in the universe by its diameter, and you will always get the same number, pi, aka the Greek letter π. In fact, NASA ...

March 14 — a day you’re more likely than most others to eat — or throw — a pie and get a reduced price on your pizza. It’s all in celebration of pi (Greek letter π), the mathematical constant and ...

Happy March 14—time to celebrate everyone’s favorite mathematical constant. Pi, or π, describes the ratio of a circle’s circumference to its diameter. Since it was first discovered more than 4,000 ...