**parabola | Definition, Equation, & Facts | Britannica**
https://www.britannica.com/science/parabola

Parabola, open curve, a conic section produced by the intersection of a right circular cone and a plane parallel to an element of the cone. As a plane curve, it may be defined as the path (locus) of a point moving so that its distance from a fixed line (the directrix) is equal to its distance from a fixed point (the focus).. The vertex of the parabola is the point on the curve that is closest ...

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