Pi Day is an annual celebration of the mathematical constant pi. Pi Day is observed on March 14 because 3, 1, and 4 are the first three significant figures of the constant. PI is the ratio of a circle’s circumference to its diameter, which is an irrational number with an infinite number of digits in a decimal representation.Pi Day is believed to have been celebrated in 1988 in a celebration organized by physicist Larry Shaw. (Source: Wikipedia)

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