- a
directrix is a
curve ****ociated with a
process generating a
geometric object, such as:
Directrix (conic section)
Directrix (generatrix)
Directrix (rational...
-
particular point,
called a focus, and some
particular line,
called a
directrix, are in a
fixed ratio,
called the eccentricity. The type of
conic is determined...
-
circular directrix. For the ellipse, both the
focus and the
center of the
directrix circle have
finite coordinates and the
radius of the
directrix circle...
- (the
directrix). The
focus does not lie on the
directrix. The
parabola is the
locus of
points in that
plane that are
equidistant from the
directrix and...
-
ellipse called the
directrix: for all
points on the ellipse, the
ratio between the
distance to the
focus and the
distance to the
directrix is a constant....
-
circular directrix related to F 1 {\displaystyle F_{1}} . This
property should not be
confused with the
definition of a
hyperbola with help of a
directrix (line)...
- shape. The path
directing the
motion of the
generatrix motion is
called a
directrix or dirigent. A cone can be
generated by
moving a line (the generatrix)...
- the
directrix. Conversely, two
tangents which intersect on the
directrix are perpendicular. This
implies that, seen from any
point on its
directrix, any...
-
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"...
-
Thioscelis directrix is a moth in the
family Depressariidae. It was
described by
Edward Meyrick in 1909. It is
found in Peru,
Bolivia and
Costa Rica....
