In mathematics, the parabola (from the Greek παραβολή)'s a conic section, the intersection of a right circular conical surface and a plane parallel to a generating straight line of that surface. Given a point (the focus) and a line (the directrix) that lie in a plane, the locus of points in that plane that're equidistant to them's a parabola. A particular case arises when the plane's tangent to the conical surface of a circle. In this case, the intersecti… (More on Parabola)