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Topic:  Shodor lessons 
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Subject:  RE: Shodor lessons 
Author:  stek 
Date:  Jan 28 2006 
Here's a slider I'd
> like to see, just for fun (and I have almost succeeded in creating
> one in Geometer's Sketchpad): an "eccentricity" slider. Slide from
> 0 through 3, say, and see a conic section change from a circle,
> through ellipses, to a parabola, then through hyperbolas. I can get
> the effect by using overhead transparencies with parallel lines
> and/or concentric circles...
 
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