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Important Terms

Axis The straight line passing through the focus and perpendicular to the directrix is called the axis of the conic section.
Vertex The points of intersection of the conic section and the axis is (are) called vertex (vertices) of the conic section.
Focal chord Any chord passing through the focus is called focal chord of the conic section.
Double ordinate A straight line drawn perpendicular to the axis and terminated at both end of the curve is a double ordinate of the conic section.
Latus rectum The double ordinate passing through the focus is called the latus rectum of the conic section.
Center The point which bisects every chord of the conic passing through it, is called the center of the conic section.


Note: Parabola has no center, but circle, ellipse, hyperbola have center.

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