From Wikipedia: π (sometimes written pi) is a mathematical constant whose value is the ratio of any Euclidean plane circle's circumference to its diameter; this is the same value as the ratio of a circle's area to the square of its radius. It is approximately equal to 3.14159265 in decimal notation. Many formulae from mathematics, science, and engineering involve π, which makes it one of the most important mathematical constants.
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| Source: Online Schooling |
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