Focus In Auxiliary Circle of Conic
Diagram showing how to construct a conic when given the focus and the auxiliary circle. As the focus moves inside the circle the ellipse broadens out until the focus reaches the center and becomes a circle.
Keywordscone, ellipse, ellipses, circle, conic section, hyperbola, construction, circles, focus, conics, foci, construct, hyperbolas
Arthur Latham Baker The Elements of Solid Geometr with Numerous Exercises (Boston, MA: Ginn & Company, 1893)