Because in the m-dd format, the date gives the first three significant digits of pi.
Pi day is when the date is the same to the first few numbers of Pi (3.14) aka March which is the 3rd month, and the 14th. (3/14)
March 14.
It is March 14th because the first 3 digits of pi are 3.14
The date can be written as 3.14.15 which are the first digits of pi. That can only happen once every hundred years.
International Pi Day, celebrated on March 14th (written as 3/14 in the month/day date format), was chosen to celebrate pi because the numerical value of the mathematical constant pi begins with the digits 3.14. This date format resembles the decimal approximation of pi, making it a fun and fitting choice to celebrate this mathematical concept.
Albert Einstein's birthday is on pi day which is March 14th
Pi day is on March 14th, because Pi=3.14 It is just a day to celebrate pi
The celebration day of pi (3.14159265...)
Pi Day is on march 14(3.14)
We have pi day to sorta symbolize the meaning of pi. I think it is just for fun
Pi Day is March 14. It is that day because it is 3-14 (the first 3 digits of pi). It is just a day to eat pie (the dessert) and celebrate pi (3.141592653589793238462643383279502884197169399375...)