Pi是圆的周长与直径的比值。 Pi是大约3.14159265358979。

一个完整圆弧度是2*pi。

Pi为Pascal的一个函数，它返回圆周率的值。

pi/4 近似于 arctan(1)。

参见

• Pi
• ArcTan 计算反正切
• 圆周率

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