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Detailed explanation-1: -Pi Day is an annual celebration of the mathematical constant (pi). Pi Day is observed on March 14 (3/14 in the month/day format) since 3, 1, and 4 are the first three significant figures of . It was founded in 1988 by Larry Shaw, an employee of the San Francisco, California science museum, the Exploratorium.

Detailed explanation-2: -U.S. Pi or pie, whether you’re a baker or a math whiz, today is your day - Pi Approximation Day on July 22 honors the concept of pi, which is denoted by the Greek letter pi and approximates to 3.14, in the most mathematically-pleasing way.

Detailed explanation-3: -March 14 marks Pi Day, an annual celebration of the mathematical sign pi. Founded in 1988 by physicist Larry Shaw, March 14 was selected because the numerical date (3.14) represents the first three digits of pi, and it also happens to be Albert Einstein’s birthday.

Detailed explanation-4: -The world celebrates Pi Approximation Day every year on 22 July. The fraction 22/7 is an approximate value of Pi, and it is for this reason that this day is commemorated on July 22. In this case, the numerator 22 represents the date, while the numerator seven represents the month.

Detailed explanation-5: -July 22 is Pi Approximation Day. Also known as Casual Pi Day, the day is dedicated to the mathematical constant pi (). Celebrate pi () by eating lots of pie. Pi denotes the relationship between a circle’s circumference and its diameter and is denoted by the fraction 22/7 which calculates approximately to 3.14.