Portability | very |
---|---|

Maintainer | byorgey@cis.upenn.edu |

The circle constant, tau.

# Documentation

The circle constant, the ratio of a circle's circumference to its
*radius*. Note that `pi = tau/2`

.

For more information and a well-reasoned argument why we should
all be using tau instead of pi, see *The Tau Manifesto*,
http://tauday.com/.

To hear what it sounds like (and to easily memorize the first 30 digits or so), try http://youtu.be/3174T-3-59Q.