Confocal ellipses
Confocal hyperbolas
Confocal ellipses and hyperbolas
Common representation
Limit curves
Twofold orthogonal system
Confocal parabolas
Graves's theorem: the construction of confocal ellipses by a string
Confocal quadrics
Definition
Focal curves
Threefold orthogonal system
Ivory's theorem
See also
References
External links