# Elliptical Conic Section Using Dandelin Spheres

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This Demonstration considers the intersection of a cone with a plane. This conic section is shown to be an ellipse. Two Dandelin spheres are drawn, inscribed in the cone above and below the plane. The two foci of the ellipse are the points of tangency of the Dandelin spheres with the plane, shown as black points.

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Contributed by: Sungkon Chang (September 2018)

Open content licensed under CC BY-NC-SA

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