結果 : how to find the focal length of a parabola
34:54

Finding The Focus and Directrix of a Parabola - Conic Sections

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Finding focal length of parabolic mirror (English)

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Video 23: Focal chord - parabola as a locus

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Conic Section : Parabola | Finding Vertex, Axis of Symmetry, Focus, Latus Rectum | Part 1 |

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Relate the Focal Length of a Parabola to its Equation

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Video 64: Find length of latus rectum of a given parabola

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