High Quality Content by WIKIPEDIA articles! ? (sometimes written pi) is a mathematical constant whose value is the ratio of any circle's circumference to its diameter in Euclidean space; this is the same value as the ratio of a circle's area to the square of its radius. The symbol ? was first proposed by the Welsh mathematician William Jones in 1706. It is approximately equal to 3.14159 in the usual decimal notation (see the table for its representation in some other bases). ? is one of the most important mathematical and physical constants: many formulae from mathematics, science, and engineering involve ?.

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