# pi – Calculate pi

Generates pi, using the formula:
```
Pi=16*arctan(1/5)-4*arctan(1/239)
```

and leaves the result in an array `\xr`, printing what is calculated
as it goes along.

The number of digits you can compute depends on your implementation of TeX. The last digit may be wrong, and if it's 0 or 9, the penultimate digit may also be wrong.

Sources | `/macros/plain/contrib/misc/pi.tex` |

Version | 0.993 |

Maintainer | Denis B. Roegel |

Topics | Calculation |

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## Community Comments