What is directrix?

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Sarvajeet Kumar

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Any line which is perpendicular to the line joining the vertex and the focus of a parabola, and is placed at a distance equal to the distance between the vertex and the focus of the parabola from the vertex is called directrix.
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A line perpendicular to the axis of symmetry used in the definition of a parabola. A parabola is defined as follows: For a given point, called the focus, and a given line not through the focus, called the directrix, a parabola is the locus of points such that the distance to the focus equals the distance...
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A line perpendicular to the axis of symmetry used in the definition of a parabola. A parabola is defined as follows: For a given point, called the focus, and a given line not through the focus, called the directrix, a parabola is the locus of points such that the distance to the focus equals the distance to the directrix. read less
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A parabola is a locus of points equidistant from a single point, called the focus of the parabola, and a line, called the directrix of the parabola.
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Dear Student, Directrix means in Geometry is a fixed line used in describing a Curve or Surface.
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