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Q: Which conic section has a directrix?

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circle and ellipse are closed curved conic section!, from bilal , Pakistan

No, a conic section does not have vertices. If it is a circle, it has a center; if it is a parabola or hyperbola, it has a focus; and if it is an ellipse, it has foci.

Leibniz

An ellipse is a conic section which is a closed curve. A circle is a special case of an ellipse.

Bi-truncated conic section, or doubly-truncated conic section

A conic section is a curve formed by the intersection of a plane with a cone (conical surface). If the section is parallel to the base of the cone, the conic section has a fixed diameter and is a circle. Any other plane that does not intersect the apex is either a parabola, a hyperbola, or an ellipse.

Any conic section.

A point in which the rays of light meet, after being reflected or refrcted, and at which the image is formed; as, the focus of a lens or mirror., A point so related to a conic section and certain straight line called the directrix that the ratio of the distace between any point of the curve and the focus to the distance of the same point from the directrix is constant., A central point; a point of concentration., To bring to a focus; to focalize; as, to focus a camera.

A point in which the rays of light meet, after being reflected or refrcted, and at which the image is formed; as, the focus of a lens or mirror., A point so related to a conic section and certain straight line called the directrix that the ratio of the distace between any point of the curve and the focus to the distance of the same point from the directrix is constant., A central point; a point of concentration., To bring to a focus; to focalize; as, to focus a camera.

the figure defined by intersection of a cone and a plane.

eclipse

A conic section.

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