This document defines and describes key terms related to conic sections, including circles, ellipses, parabolas, and hyperbolas. It explains that conic sections have a center, vertex, focus, directrix, linear eccentricity, and focal parameter. Additionally, it notes that parabolas have an axis of symmetry and that conic sections can be described as a locus of points.

3. Types of Conic
Sections:
 Circle
 Ellipse
 Parabola
 Hyperbola

5. Center
 It is the point (h, k) at the
center of a circle, or an ellipse,
or an hyperbola

6. Vertex
 For Parabola, it is the point at
the end of the parabola
 For Hyperbola, it is the turning
point of a branch of a
hyperbola

7. Focus
 It is the point from which
distances are measured in
forming a conic
 A place where the distance-
lines converges

8. Directrix
 It is the line from which
distances are measured in
forming a conic

9. Linear Eccentricity
 It is the distance between the
center and the focus (or one
of the two foci)

10. Focal Parameter
 It is the distance between the
focus (or one of the foci) and
the directrix

11. Locus
 A set of points satisfying some
condition or set of conditions

12. Axis of Symmetry
 A line perpendicular to the
directrix passing through the
vertex of a parabola