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

User Nick Beeuwsaert
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Answer:

the answer is a parabola

User Cweston
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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.
User Araqnid
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