Paul Bourke wrote:
> Some may enjoy this, using PovRay CSG to illustrate answers
> to geometric problems.
>    http://astronomy.swin.edu.au/~pbourke/geometry/toruscut/
> Before you look ask yourself, 
>    How many ways can a torus be cut (with a single plane) 
>    so that the resulting cross sections are perfect circles?

Nice, but the really interesting question is how you can proove that 
these three ways are the only ones...

Christoph

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Last updated 25 Oct. 2003 _____./\/^>_*_<^\/\.______

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