Tangents to an Ellipse
Illustration showing the tangents drawn at two corresponding points of an ellipse and its auxiliary circle cut the major axis produced at the same point.
Keywordsellipse, oval, ellipses, ovals, conic sections, section, radius, focus, center, foci, chords, major axis, minor axis, external point, tangents, focal chord, focal radii, tangent line
GalleriesConic Sections: Ellipses
G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 436