# Dandelin Spheres for an Ellipse

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Slice a cone with a plane so that the intersection is bounded. Although it might appear that the section is an oval that is fatter on the more open part of the cone, in fact the section is an ellipse.

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Contributed by: George Beck (January 2008)

Open content licensed under CC BY-NC-SA

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See Bill Casselman's translation of Dandelin's original 1826 article, "Hyperboloids of revolution and the hexagons of Pascal and Brianchon".

## Permanent Citation