Original: Ellipse at the Encyclopedia of Mathematics ( Springer ) Ellipse at Planetmath External links Apollonius ' Derivation of the Ellipse at Convergence Ellipse & Hyperbola Construction - An interactive sketch showing how to trace the curves of the ellipse and hyperbola .
Simplified: Other websites Ellipse & Hyperbola Construction - An interactive sketch showing how to trace the curves of the ellipse and hyperbola .