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Pi -- from Wolfram MathWorld
瀏覽：1323
日期：2025-10-15
The constant pi, denoted pi, is a real number defined as the ratio of a circle's circumference C to its diameter d=2r, pi = C/d (1) = C/(2r) (2) pi has decimal expansion given by pi=3.141592653589793238462643383279502884197... (3) (Sloane's A000796). Pi's...看更多
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