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what is the history of pi?
The number ?  is a mathematical constant that is the ratio of a circle's circumference to its diameter. The constant, sometimes written pi, is approximately equal to 3.14159. It has been represented by the Greek letter ? since the mid-18th century. ? is an irrational number, which means that it cannot be expressed exactly as a ratio of two integers  its decimal representation never ends and never repeats. It is a transcendental number – a number that cannot be produced with a finite sequence of algebraic operations.


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