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The number Ï is a mathematical constant, the ratio of a circle 's circumference to its diameter, commonly approximated as 3.14159. It has been represented by the Greek letter  Ï  since the mid-18th century, though it is also sometimes spelled out as  pi  (/paÉª/). Being an irrational number, Ï cannot be expressed exactly as a fraction (equivalently, its decimal representation never ends and never settles into a permanent repeating pattern).
more digits... Pi Day is celebrated on March 14th (3/14) around the world. Pi (Greek letter âÏâ) is the symbol used in mathematics to represent a constant â the ratio of the circumference of a circle to its diameter â which is approximately 3.14159. Pi has been calculated to over one trillion digits beyond its decimal point. As an irrational and transcendental number, it will continue infinitely without repetition or pattern. While only a handful of digits are needed for typical calculations, Piâs infinite nature makes it a fun challenge to memorize, and to computationally calculate more and more digits. Learn More About Pi