Geometry and the Discrete Fourier Transform

Revised version of a November 2011 Feature Column on the AMS website. The underlying technologies changed and so tweaks had to be made in order that it function as intended, and, indeed, how it used to. I kept an older version if you want to see it.

Web Geometry: some simple uses of the Geometer's Sketchpad Java Applet

Note these demonstrations use the Geometer Sketchpad Java applet, so they will not display in Google's Chrome browser after Version 42, or in any other browser which does not have a modern Java plugin activated.

• An ancient triangle
• A (regular) triangle of centroid 0
• A regular triangle and anti-triangle
• A regular pentagon and anti-pentagon
• A regular pentagram and anti-pentagram
• A regular pentagon and pentagram
• A regular pentagon and an anti-pentagram
• Square and Anti-Square Averaged
• Square and Anti-Square and Dipole Averaged

Related links (some even linkages) [Flash animations now (12 Sep 2016) on http://www.mekanizmalar.com.]

• Chebyshev's Straight-line Mechanism at http://www.mechanisms101.com
• Watt's Linkage at http://www.mechanisms101.com

         [Last Modified: Sunday, 12-Sep-2016 12:35:47 EDT]