Orthogonal chords are two chords on a graph such as an elliptic circle, and chords are line segments connecting any two points of the graph.

A moving point is an arbitrary point on a graph, so it is called a moving point because it is arbitrary.

The focus has a solution, and an ellipse is a trajectory whose sum of the distances between two fixed points on a plane is constant. These two fixed points are called focal points. See if you want an ellipse or a parabola.