confocal conics

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• confocal — (ˈ)kän+ adjective Etymology: com + focal mathematics : having the same real or imaginary foci used of conic sections and of conicoids whose principal sections are confocal conics …   Useful english dictionary

• Focus (geometry) — Point F is a focus point for the red ellipse, green parabola and blue hyperbola. In geometry, the foci (  / …   Wikipedia

• Hyperbola — This article is about a geometrical curve, a conic section. For the term used in rhetoric, see Hyperbole …   Wikipedia