Concept information
Preferred term
Dandelin spheres
Definition(s)
-
In geometry, the Dandelin spheres are one or two spheres that are tangent both to a plane and to a cone that intersects the plane. The intersection of the cone and the plane is a conic section, and the point at which either sphere touches the plane is a focus of the conic section, so the Dandelin spheres are also sometimes called focal spheres.
(Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Dandelin_spheres)
Broader concept(s)
Synonym(s)
- focal spheres
In other languages
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French
-
théorème belge sur la section conique
-
théorème de Dandelin-Quetelet
URI
http://data.loterre.fr/ark:/67375/PSR-P3XK66VD-F
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