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Topic: Shodor lessons


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Subject:   RE: Shodor lessons
Author: stek
Date: Jan 28 2006
On Jan 26 2006, Craig wrote:
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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