Image:Pi-unrolled.gif

From Wikipedia, the free encyclopedia

Image
File history
File links

Pi-unrolled.gif‎ (261KB, MIME type: image/gif)

This is a featured picture, which means that members of the community have identified it as one of the finest images on the English Wikipedia, adding significantly to its accompanying article. If you have a different image of similar quality, be sure to upload it using the proper free license tag, add it to a relevant article, and nominate it.

[edit] Summary

Animation of the act of unrolling a circle's circumference, illustrating the ratio π.

[edit] FP caption

A number line is marked off by a circle of unit diameter. Starting from zero, the circle "unrolls" its circumference. At one full turn, the unrolled circumference has extended to the point we call π. This number is irrational, transcendental, and cannot be constructed with compass and straightedge. However, π is entirely real. If you have a nail in your tire, you drive your car along the road π times the size of your tire each time you hear a click.

Illustration credit: John Reid
Archive - More featured pictures...

[edit] Licensing

I, the creator of this work, hereby grant the permission to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
Subject to disclaimers.

purge

File history

Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version.
Click on date to download the file or see the image uploaded on that date.

(del) (cur) 21:01, 15 October 2006 . . John Reid (Talk | contribs) . . 720×228 (266,713 bytes)
(del) (rev) 19:53, 5 October 2006 . . John Reid (Talk | contribs) . . 360×114 (64,506 bytes)
(del) (rev) 01:27, 19 April 2006 . . John Reid (Talk | contribs) . . 360×132 (39,194 bytes)
(del) (rev) 17:25, 5 April 2006 . . John Reid (Talk | contribs) . . 362×132 (80,458 bytes)
(del) (rev) 17:24, 5 April 2006 . . John Reid (Talk | contribs) . . 362×132 (36,660 bytes) (Animation of the act of unrolling a circle's circumference, illustrating the ratio π. )