directrix's Usage Examples:

surface, directrix is a line, the axis of the cylinder) torus (pipe surface, directrix is a circle), right circular cone (canal surface, directrix is a line.

The parabola is the locus of points in that plane that are equidistant from both the directrix and.

focus) and a fixed line (the directrix), where distance from the directrix is measured along a line perpendicular to the directrix.

perimeter of the base of a cone is called the "directrix", and each of the line segments between the directrix and apex is a "generatrix" or "generating line".

to the directrix and to each latus rectum.

The focus does not lie on the directrix.

This property should not be confused with the definition of a hyperbola with help of a directrix (line).

One description of a parabola involves a point (the focus) and a line (the directrix).

a directrix is a curve associated with a process generating a geometric object, such as: Directrix (conic section) Directrix (generatrix) Directrix (rational.

Conversely, two tangents which intersect on the directrix are perpendicular.

circular directrix related to F 1 {\displaystyle F_{1}} .

The latus rectum is the chord parallel to the directrix and passing through a focus; its half-length is the semi-latus rectum (ℓ).