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freeCodeCamp/guide/chinese/mathematics/pi/index.md
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---
title: PI
localeTitle: PI
---
## PI
`PI = 𝜋 = 3.14159265359`
PI是一个数学常数其值约等于3.14159265359。它被定义为`ratio of circumference of a circle to its diameter` 。 PI由希腊字母`𝜋`表示,广泛用于物理和数学。
无论圆的大小如何,比率π=圆周/直径始终保持不变。例如,即使我们采用前一个圆的直径的两倍的新圆,那么新圆的圆周将恰好是前一个圆的两倍,保持π的值恒定。