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Mathin
Entry058Stage 3 · Grades 5–6图形与几何

圆的周长与圆周率

任何圆的周长÷直径都是同一个数:π≈3.14。

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Definition

量一量、算一算:任何圆的周长除以直径,商都是同一个数——圆周率 π\pi,约 3.14159…。于是周长 C=πd=2πrC=\pi d=2\pi r。一个永远除不尽的数,藏在每一个圆里。

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