A set of coordinates used to describe a point in a plane, in which the coordinates are based on two focal points (foci) rather than a single origin. A point is represented by two distances: the distance from each focus to the point.
A set of coordinates used to describe a point in a plane, in which the coordinates are based on two focal points (foci) rather than a single origin. A point is represented by two distances: the distance from each focus to the point.