Conics  the classical definitionMenaechus is usually credited with their discovery. The names ellipse, parabola and hyperbola were introduced by Apollonius. In the nineteenth century, the ideas of projective geometry and duality were developed by
In these pages, we shall concentrate on incidence properties We shall approach the subject by geometry and by algebra.
Classically, a conic C is defined in terms of
There are three basic types of conic, depending on the value of e.
Observe that each conic has an axis of symmetry through F, perpendicular to D, Conics may also be defined as sections of a cone.
