Focal Definition of Ellipse
The applet below illustrates the focal property of the ellipse: given two points F and F' (called the foci of the ellipse), ellipse is the locus of points P the sum of whose distances to the foci is constant: PF + PF' = const. This property is often taken for a definition of ellipse. (A different demonstration can be found elsewhere.)


[an error occurred while processing this directive]
Activities
Contact
Front page
Contents
Geometry
Copyright © 19962018 Alexander Bogomolny