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'''Pi day''' is a [[holiday | "Holiday"]] celebrating [[mathematics]].

'''Pi day''' is a [[holiday | holiday]] celebrating [[mathematics]].

Pi Day, a facetious holiday celebrating the mathematical constant [[Pi]] is observed on March 14.  Celebrations often involve eating pie, cookies or some other spherical delicacy.  The date comes from the first three digits of pi (3/14) with some people begin their celebration at 1:59:26.5 the following digits (3.14159265).  Many Elementary and Middle School teachers use March 14 to introduce their students to the concept of Pi  

Pi Day, a holiday celebrating the mathematical constant [[Pi]] is observed on March 14.  Celebrations often involve eating pie, cookies or some other spherical delicacy.  The date comes from the first three digits of pi (3/14) (in american notation) with some people beginning their celebration at 1:59:26.5 (the following digits (3.14159265)).  Many Elementary and Middle School teachers use March 14 to introduce their students to the concept of Pi  

Pi Approximation day is a similar holiday, celebrated on July 22 (from the approximation 22/7).  

Pi Approximation day is a similar holiday, celebrated on July 22 (from the approximation 22/7).