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Directrix - a feminine form of director in the context of grammatical gender Topics referred to by the same term This disambiguation page lists mathematics articles associated with the same title.
"Parabola" is used frequently. It first appears attached to two diagrams from Ted's geometry lessons, one of a parabola showing the curve as the locus of points equidistant from a focus and a directrix, the other as a cross-section of a cone. Later uses, along with "equidistant" and "directrix", are vague and metaphorical.
Examples include the plane, the lateral surface of a cylinder or cone, a conical surface with elliptical directrix, the right conoid, the helicoid, and the tangent developable of a smooth curve in space. A ruled surface can be described as the set of points swept by a moving straight line.
Examples [ edit ] A cone can be generated by moving a line (the generatrix) fixed at the future apex of the cone along a closed curve (the directrix); if that directrix is a circle perpendicular to the line connecting its center to the apex, the motion is rotation around a fixed axis and the resulting shape is a circular cone.
Examples: The orthoptic of a parabola is its directrix (proof: see below),; The orthoptic of an ellipse + = is the director circle + = + (see below),; The orthoptic of a hyperbola =, > is the director circle + = (in case of a ≤ b there are no orthogonal tangents, see below),
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The pear fromage biscuit was another example of this balanced profile. It tasted like a cream cookie, with hints of Asian pear, white chocolate, and cheese that integrated surprisingly well.
This might take place, Immigration Minister Marc Miller said Tuesday, "for example, in cases of mass fraud." Miller said Canada also "will be introducing measures to streamline the asylum system ...