| 11. | For the parabola, the center of the directrix moves to the point at infinity ( see projective geometry ).
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| 12. | It has been mentioned that circles in the Euclidean plane can not be defined by the focus-directrix property.
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| 13. | A parabola has a single axis of reflective symmetry, which passes through its focus and is perpendicular to its directrix.
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| 14. | This is also the equation of the directrix of this parabola, so the two perpendicular tangents intersect on the directrix.
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| 15. | This is also the equation of the directrix of this parabola, so the two perpendicular tangents intersect on the directrix.
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| 16. | The distance from the center to a directrix is } } while the distance from the center to a focus is.
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| 17. | The distances and are equal because E is on the parabola, F is the focus and C is on the directrix.
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| 18. | Because Rhage can't feed from Mary, he reaches out to the Directrix and requests a Chosen to feed from.
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| 19. | In geometry, a directrix, the right conoid, the helicoid, and the tangent developable of a smooth curve in space.
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| 20. | I currently use DESMOS, which I love in general, but it doesn't do anything with foci and directrix lines.
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