directrix

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13 - Conic Sections: Parabola, Focus, Directrix, Vertex & Graphing - Part 1

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Equation for parabola from focus and directrix | Conic sections | Algebra II | Khan Academy

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Writing the equation of a parabola given focus and directrix

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Parabola : Directrix, Focus, locus and equation : ExamSolutions

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Eccentricity and directrix of the conic section (KristaKingMath)

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Easiest Way To: Find the Focus, Directrix & Vertex of Any Parabola

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Write the equation of a parabola given vertex and directrix

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Find Vertex Focus and Directrix of Parabola (Conic Sections) | Math Dot Com

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How to find the directrix, focus and vertex of a parabola