What object is defined using a directrix and a focus? ...?

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asked Oct 1, 2017 171k views

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Araqnid · Answer 1 · 2017-10-07T10:08:32+0000

Conic sections are defined using a directrix (a fixed line used in describing a curve or surface) and a focus, and those are: parabola, ellipse, and hyperbola.

What object is defined using a directrix and a focus? ...?

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