11.1 Conics
 the word conic derives from the word cone. A cone has a fixed line called an
axis
, a
vertex
,
generators,
and the two parts(sides) of the cone are called
nappes
.

conics
, an abbreviation for
conic sections
, are curves that result from the intersection of a right circular
cone and a plane.
Circles
are made when a plane is perpendicular to the axis of the cone and intersects
each generator, but intersects only one nappe of the cone;
parabolas
when the plane is tilted farther so
that it is parallel to one generator and intersects only one nappe of the cone; and
hyperbolas
when the
plane intersects both nappes.
Degenerate Conics
– if the plane does not contain the vertex, it is the intersection of the plane and the
cone is a point, a line, or a pair of intersection lines.
11.2 The Parabola
 a
parabola
is the collection of all points P in the plane that are the same distance from a fixed point F as
they are from a fixed line D. The point F is called the
focus
of the parabola, and the line D is its
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 Fall '07
 BRUNSDEN,VICTORW
 Math, Cone, Conic Sections, Conic section, latus rectum

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