Pi

│ 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 about 3.14159265358979. A full circle has 2*Pi radians. In Pascal, Pi is a function which returns the value of pi.

Pi/4 is the same as arctan(1).

See also

• Pi
• ArcTan Calculate arctangent.