Pi, a mathematical constant denoted by the Greek letter π, is the ratio of a circle's circumference C to its diameter d: π = ...

Get top local stories in Connecticut delivered to you every morning. Sign up for NBC Connecticut's News Headlines newsletter. But we do have some ideas. It seems that the Egyptians used pi in the ...

Thursday is Pi Day, a national celebration of the mathematical concept, which is the ratio of a circle's circumference to its diameter and equals 3.14... Schools and museums often plan events to ...