# Conic sections

- Author:
- a.zampa

- Topic:
- Circle, Conic Sections, Ellipse, Hyperbola, Parabola

Conic sections have a unifying definition: given a point , a line and a real number , the conic having focus , directrix and eccentricity is the locus of all points of the plane such that the ratio between their distance from and their distance from is equal to : .