Spiric sections

plane algebraic curve

quartic plane curve defined as the set (or locus) of points in the plane

500px|right|thumb|Hippopede (red) given as the pedal curve of an [[ellipse (black). The equation of this hippopede is: 4x^2 + y^2 = (x^2 + y^2)^2]]

quartic plane curve; bicircular quartic curves that are symmetric with respect to the x and y-axes. Spiric sections are included in the family of toric sections and include the family of hippopedes and the family of Cassini ovals