Pi Day History
Pi Day celebrates the mathematical constant π (pi) or 3.141592653... . Pi is the ratio between the circumference (the distance around the circle) and diameter (the distance through the center of the circle). Pi is a constant, therefore it will be the same for circles of all sizes. Pi is a special number due to its infinite and patternless nature, meaning that the digits after the decimal point never repeat themselves in a specific order.
Pi Day Facts & Quotes
Pi Day Top Events and Things to Do