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The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.The number π appears in many formulae across mathematics and physics.
The best known approximations to π dating to before the Common Era were accurate to two decimal places; this was improved upon in Chinese mathematics in particular by the mid-first millennium, to an accuracy of seven decimal places.
Proofs of the mathematical result that the rational number 22 / 7 is greater than π (pi) date back to antiquity. One of these proofs, more recently developed but requiring only elementary techniques from calculus, has attracted attention in modern mathematics due to its mathematical elegance and its connections to the theory of Diophantine approximations.
Pi Day has been observed in many ways, including eating pie, throwing pies and discussing the significance of the number π, due to a pun based on the words "pi" and "pie" being homophones in English (/ p aɪ /), and the coincidental circular shape of many pies. [1] [19] Many pizza and pie restaurants offer discounts, deals, and free products ...
National Pie Day is a celebration of pies that occurs annually in the United States on January 23. It started in the mid-1970s by Boulder, Colorado teacher Charlie Papazian [1] after he declared his own birthday, January 23, to be National Pie Day. [2] Since 1986, National Pie Day is sponsored by the American Pie Council. [3]
Raspberry Pi (/ p aɪ /) is a series of small single-board computers (SBCs) developed in the United Kingdom.The original Raspberry Pi computer was developed by the Raspberry Pi Foundation in association with Broadcom.