Tangent to an Ellipse Small 320×214 Medium 640×428 Large 1024×685 Download Tiff Original 2400×1606 | (386.1 KB) Description Diagram an ellipse with a tangent line that illustrates "A line through a point on the ellipse and bisecting the external angle between the focal radii is a tangent." Keywords cone, conic section, conics, ellipse, ellipses, focal radii, foci, focus, lines, radius, tangent line Galleries Conic Sections: Ellipses Source: Arthur Latham Baker The Elements of Solid Geometr with Numerous Exercises (Boston, MA: Ginn & Company, 1893)
