Złota elipsa i złota hiperbola. Didactics of Mathematics, 2011, Nr 8 (12), s. 55-69

An ellipse, parabola and hyperbola are the curve that can be obtained as the plane section of cone; there are characterizations, one of which is by means of the focus and directrix property. The golden ellipse or the golden hyperbola is the curve, which has golden eccentricity.