Dating directrix

Conics also appear in art, architecture and engineering.Wonderful examples can be see at the website: the Math Forum site: Conics have been defined several ways.The minor axis is perpendicular to the major axis and their intersection point is the center.

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Occasionally well be using conics that have been shifted.

One set of definitions involves a set of points in a plane and the distance(s) of these points to points and/or lines.

Circle: the set of points in a plane that are equidistant (the radius r) from a given point (the center This is the equation of the parabola opening to the right with vertex at the origin.

This is the standard form of a parabola with vertex at the origin, opening to the right.

It also locates the focus and the directrix of a parabola.

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