Conic Section Showing an Ellipse Small 196×320 Medium 391×640 Large 626×1024 Download Tiff Original 1468×2400 | (856.6 KB) Description Illustration showing the definition of an ellipse as a conic section. "The section of a right circular cone made by a plane that cuts all the elements of the surface of the cone is an ellipse." Keywords cone, conic sections, ellipse, ellipses, oval, ovals, section Galleries Conic Sections: Ellipses Source: G.A. Wentworth Plane And Solid Geometry (Boston: Ginn & Company, 1899) 442
