| This exactly means that the directrix is the polar of the focus, while the focus is the pole of the directrix with respect to the parabola. |
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| The directrix is used in the construction, which follows, mutatis mutandis, the same course as the above construction in the case of the ellipse. |
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| It is the pedal curve of the parabola where the pedal-point is taken as the reflection of the focus in the directrix. |
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| The vertex and the focus determine a line, perpendicular to the directrix, that is the axis of the parabola. |
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| The focus and directrix of a hyperbola were considered by Pappus. |
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| The focus and directrix of a parabola were considered by Pappus. |
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| The bridge crossing the river Humecillo, the banks wide apart here despite the short distance from its source, is built of masonry and has two directrix spans with slightly pointed arches and large span width. |
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| A finite cone has a finite, but not necessarily fixed, base, the surface enclosed by the directrix, and a finite, but not necessarily fixed, length of generatrix, called an element. |
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| Start by plotting all the points that are equidistant from the directrix and from the focus. |
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| Image sensors for machine vision are selected to enhance directrix detection. |
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| The constructive parameters of the workpiece and tool and also the generation ones determine the form of the directrix and generatrix of the polygonal processed surface. |
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| The Kinematical Generation of the Directrix Curves of the Geometrical Surfaces. |
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| A 21,000-square-foot building on the same property is leased long-term to Directrix. |
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| DirectriX was one of five teams that completed the Challenge. |
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