Eccentricity is defined as the ratio of distances between a point on the curve and the focus and its directrix. For parabola eccentricity e = 1, for ellipse e < 1 for hyperbola e > 1

Eccentricity is defined as the ratio of distances between a point on the curve and the focus and its directrix. For parabola eccentricity e = 1, for ellipse e < 1 for hyperbola e > 1