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Tool: Conic_Connections
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Go to: http://www.dynamicgeometry.com/.../Advanced_Sketch_Gallery.html#3D Explorations (opens a new window)
Description: The user manipulates a plane and double-napped cone to generate graphs and equations of conic sections. Eccentricity, foci, and directrices are also illustrated in both 2- and 3-D.
Technology Type: Sketchpad 
Author: Kent Thele
Language: English 
Cost: Does not require payment for use

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Courses: Algebra II Circles, Parabolas, Ellipses, Hyperbolas, Graph from equation, Equation from graph
PreCalculus general, standard forms of equations, directrix, foci, vertex, foci, asymptotes, circles, vertices, foci

  Ara
Comment:It would be much nicer if it had some interactive questions.