Samuel Benge <sbe### [at] hotmailcom> wrote in 
news:3FC### [at] hotmailcom:
> The third way is surprising....

Here's an image that shows this:

http://home.no/t-o-k/povray/Isosurfaces-Rotated_Tori.jpg


Also have a look at this page:

http://mathworld.wolfram.com/Torus.html
(See the illustration halfway down the page.)


Tor Olav


> 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?

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