Question

Which is the best definition of a conic section

Answer 1

Are there options? Otherwise the definition is: a figure formed by the intersection of a plane and a right circular cone. Depending on the angle of the plane with respect to the cone, a conic section may be a circle, an ellipse, a parabola, or a hyperbola.

Answer 2

It is the figure formed by the intersection of a plane and circular cone!