Definition of an Ellipse: Locus Construction via Two Circles

This GeoGebra applet demonstrates the classical geometric definition of an ellipse using two auxiliary circles. The construction employs fundamental geometric objects including points, circles, circle arcs, segments, orthogonal lines, and intersections, combined with the Locus command to trace the ellipse curve. An ellipse is defined as the locus of points in a plane whose sum of distances to two