# Pi

From Lazarus wiki

│
**Deutsch (de)** │
**English (en)** │
**suomi (fi)** │
**français (fr)** │
**русский (ru)** │
**中文（中国大陆） (zh_CN)** │

Pi is the ratio of the circumference of a circle to its diameter. Pi is around 3.14159265358979. A full circle has 2*Pi radians. Pi is in Pascal a function which returns the value of pi.

Pi/4 is same than arctan(1).

# See also

- ArcTan Calculate arctangent.