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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。