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6:36
YouTube
MATHguide
Parabolas: Directrix, Focus, Vertex
This MATHguide video explains details the characteristics of a parabola, namely the relationship between the directrix, focus, and vertex. View our text lesson on conic sections at http://www.mathguide.com/lessons/ConicSections.html.
22.9K views
Feb 19, 2016
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