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In mathematics, a directrix is a straight line associated to a geometric object, such as: Directrix (conic section) Directrix (rational
Kaynak: Directrix

those points whose distances to some point, called a focus , and some line, called a directrix, are in a fixed ratio, called the eccentricity .
Kaynak: Conic section

For the ellipse, both the focus and the center of the directrix circle have finite coordinates and the radius of the directrix circle is
Kaynak: Focus (geometry)

This is also the equation of the directrix of this parabola, so the two perpendicular tangents intersect on the directrix. Dimensions of
Kaynak: Parabola

A catenoid is a three- dimension al surface made by rotating a catenary curve about its directrix. Not counting the plane, it is the
Kaynak: Catenoid

pass through a fixed point — the apex or vertex — and any point of some fixed space curve — the directrix — that does not contain the apex.
Kaynak: Conical surface

Directrix : File:Ellipse Properties of Directrix. svg | of the ellipse is associated with a line parallel to the minor axis called a directrix .
Kaynak: Ellipse

Proof of the focus-directrix property: The directrix of a conic section can be found using Dandelin's construction. Each Dandelin sphere
Kaynak: Dandelin spheres

Directrix and focus: ratio of the distances to one focus and to a line (called the directrix) is a constant epsilon that is larger than 1.
Kaynak: Hyperbola

A parabola is the set of points in a plane equidistant from a fixed point (the focus) and a fixed line (the directrix), where distance
Kaynak: Equidistant

Other examples are a conical surface with elliptical directrix , the right conoid , the helicoid , and the tangent developable of a
Kaynak: Ruled surface

use the focus and directrix to obtain any number of points on a parabola —the first instance on record of the practical use of the directrix.
Kaynak: Anthemius of Tralles

(The focus of the parabola is the point F and the directrix is the line L.) The value of P 2 is: ln(1 + sqrt2) + sqrt2 2.29558714939
Kaynak: Universal parabolic constant

The broken line is the directrix of the surface; the parallel lines are its generators (or elements). If the broken line is closed (i.e.
Kaynak: Prismatic surface

All the vectors L(u) are parallel to the same plane, called the directrix plane of the surface. This can be characterized by the
Kaynak: Catalan surface

The perimeter of the base of a cone is called the 'directrix', and each of the line segments between the directrix and apex is a '
Kaynak: Cone

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