Until now I used Maple for 2D and Povray for 3D images and animations to 
put them on my mathematical website. But I find that using Povray for 2D 
applications gives nicer images and offers more possibilities.

The "quadratrix" is a famous curve that plays a historical role in the 
problem of the trisection of an angle and the quadrature of a circle.

I attach the animated gif-file that illustrates the definition of this 
curve. More details about the curve and it's use can be found on

http://cage.ugent.be/~hs/quadratrix/quadratrix

P.S. Some days ago I already tried to post this message, but without 
success. Following the advice I got to use an other newsreader program, 
I changed from Gravity to Thunderbird. I hope it will work now.

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Download 'quadr02.gif' (48 KB)

Preview of image 'quadr02.gif'