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directrix    
n. 准线

准线


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  • Finding the Directrix of Parabola - Cuemath
    Directrix of a parabola is the reference line, which helps to define the equation of parabola and is useful to derive the equation of a parabola
  • Focus and Directrix of a Parabola - Formulas, Examples Diagrams
    The point is the focus of the parabola, and the line is the directrix The focus lies on the axis of symmetry, and the directrix is parallel to either the x-axis or the y-axis
  • Focus and Directrix of a Parabola - GeeksforGeeks
    The directrix is a fixed straight line that is perpendicular to the axis of a parabola A parabola is defined as the set of all points that are equidistant from a fixed point (focus) and a fixed line (directrix)
  • Parabola focus directrix review (article) | Khan Academy
    A focus and directrix are just a point and a line, respectively We can define a parabola as the set of all points that are equidistant from the focus and the directrix
  • Focus and Directrix of a Parabola - Mathwarehouse. com
    Focus and Directrix of a Parabola A parabola is a locus of points equidistant from both 1) a single point, called the focus of the parabola, and 2) a line, called the directrix of the parabola
  • Directrix - Wikipedia
    Directrix In mathematics, a directrix is a curve associated with a process generating a geometric object, such as: Directrix (conic section) Directrix (ellipse) Directrix (generatrix) Directrix (rational normal scroll)
  • Parabola - Math is Fun
    To make it easy to build, let's have it pointing upwards, and so we choose the x2 = 4ay equation And we want "a" to be 200, so the equation becomes: x2 = 4ay = 4 × 200 × y = 800y Rearranging so we can calculate heights: y = x2 800 And here are some height measurements as you run along: Try to build one yourself, it could be fun!
  • Directrix Definition (Illustrated Mathematics Dictionary)
    A line used to help define a shape, typically used for conic sections like parabolas and hyperbolas Example: a parabola can be defined as a curve where any point is at an equal distance from the directrix (a line) and the focus (a point)
  • Directrix of a Parabola — Formula, How to Find Examples
    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
  • Intro to focus directrix - Khan Academy
    A parabola is the set of all points equidistant from a point (called the "focus") and a line (called the "directrix") See this video to learn more about this





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