Dupin Cyclides

 From:  bemfarmer
Draft2 removes the duplicate little circle.
c>a is not permitted or sqrt of negative number occurs. I'd better add a check for this. Also for negativity...

Here is another version with both "U" and "V". (I think uValue= MoI V, and vice versa).

Did a small circle sweep.

- Brian

EDITED: 24 Jun 2016 by BEMFARMER

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