And when it comes to learning, you'll feel smarter than ever with these interesting facts about pi below. Ahead, you'll uncover all sorts of tidbits, from the history of how pi got its name to the ...

Pi, a mathematical constant denoted by the Greek letter π, is the ratio of a circle's circumference C to its diameter d: π = C/d. The circumference of a circle is, in turn, equal to 2πr, where ...