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22nd July - Pi APPROXIMATION DAY

  •  Pi Approximation Day is observed on 22 July every year because of the value of Pi that is 22/7.
  • While Pi Day is observed on 14th March.
  • Pi APPROXIMATION day is also known as Casual Pi Day, the day is dedicated to the mathematical constant pi (π).


  • 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.

  • People in countries that write their dates in the date/ month format celebrate Pi Approximation or Casual Pi Day on my 22 July or 22/7. 

  • On the other hand, those who write their date in month/ date format celebrate Pi Day on March 14 (3/14 or 3-14) because the first three digits of the date correspond to the first three digits of pi - 3.14.

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