## directrixThe directrix is the line that, together with a point called the focus, serves to define a conic section as the locus of points whose distance from the focus is proportional to the horizontal distance from the directrix. If the ratio r = 1, the conic is a parabola, if r < 1, it is an ellipse,
and if r > 1, it is a hyperbola. ## Related category• PLANE CURVES | |||||

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