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directrix

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Directrix - Wikipedia
In mathematics, a directrix is a curve associated with a process generating a geometric object, such as: Directrix (conic section) · Directrix (ellipse). en.wikipedia.org
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Directrix - Varsity Tutors
A directrix is a line, perpendicular to the parabola's symmetry axis, that does not touch the parabola, and is horizontal or vertical. www.varsitytutors.com
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Directrix of a conic - Applied Mathematics Consulting
You can define a conic section as the set of points whose distance to a focus equals a constant multiple of the distance to a line called the directrix. www.johndcook.com
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directrix
directrix (dɪˈrɛktrɪks) Pl. -ices. [a. med. or mod.L. dīrectrix, fem. of *dīrector director.] 1. = directress.1622 H. Sydenham Serm. Sol. Occ. ii. (1637) 112 As if the same pen had beene as well the directrix of the languages, as the truth. 1656 Artif. Handsom. (1662) 31 The Regent and directrix of ... Oxford English Dictionary
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Parabola focus & directrix review (article) - Khan Academy
The set of all points whose distance from a certain point (the focus) is equal to their distance from a certain line (the directrix). www.khanacademy.org
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Finding the Directrix of Parabola - Cuemath
The directrix of a parabola is a line that is perpendicular to the axis of the parabola. The directrix of the parabola helps in defining the parabola. www.cuemath.com
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Conic Section Directrix -- from Wolfram MathWorld
The directrix of a conic section is the line which, together with the point known as the focus, serves to define a conic section as the locus of points whose ... mathworld.wolfram.com
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Finding The Focus and Directrix of a Parabola - Conic Sections
This video tutorial provides a basic introduction into parabolas and conic sections. It explains how to graph parabolas in standard form and ... www.youtube.com
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Intro to focus & directrix (video) - Khan Academy
A parabola is the set of all points equidistant from a point (called the focus) and a line (called the directrix). See this video to learn more about this. www.khanacademy.org
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DIRECTRIX Definition & Meaning - Merriam-Webster
1. archaic : directress 2. a fixed curve with which a generatrix maintains a given relationship in generating a geometric figure www.merriam-webster.com
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Thioscelis directrix
Thioscelis directrix is a moth in the family Depressariidae. It was described by Edward Meyrick in 1909. wikipedia.org
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Equation of Directrix of a Parabola > Find the equation of the directrix of the parabola $y^2+4y+4x+2=0$ I tried it as follows: $$(y+2)^2+4x-2=0$$ $$(y+2)^2=-4(x-\frac{1}{2})$$ On comparing with $Y^2=-4aX, a>0$, I g...
vertex is at: $ \quad V\quad : \quad \left(x(h),h \right)=(k,h)$ The focus is at : $\quad F \quad :\quad (k+p,h)\; $ with $p=\dfrac{1}{4a}$ and the directrix has equation: $d \quad : \quad x=k-p$ We can easily see that for your parabola $x=-\frac{1}{4}y^2-y-\frac{1}{2}$ the directrix is the line $x=\frac{
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Hyperbola with its directrix The equation $9x^2 - 16y^2 -18x +32y-151=0$ represents a hyperbola . We have to find the equation of its directrix. I simplified the equation and got : $$(3x-1)^2 -(4y-1)^2 = 151$$ And f...
Once you have rewritten your equation as $$ {(x-x_0)^2\over a^2}-{(y-y_0)^2\over b^2}=1, $$ then the equation of a directrix is $x=x_0+a/e$, where $e=\
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Proving ellipse focus-directrix implies equation On cuttheknot.org, a proof is given that the focus-directrix definition implies the equation definition (i.e. that an ellipse is a planar curve with equation $\frac{x^2...
Given a focus $F$, directrix $d$ and eccentricity $e\in(0,1)$, the center of the ellipse, and so the origin of the coordinate system posited in the proof [focus/directrix ellipse]( Let $D$ be the intersection of the directrix $d$ and the perpendicular through $F$.
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Reconciliation of Cone-Slicing and Focus-Directrix Definitions of Conic Sections It is well known that the family of conics is derived by slicing an infinite double-napped right circular cone, with the specific type o...
[From The circle (the directrix line is at infinity): ![Similar picture for the circle]( The parabola: ![Similar picture for the parabola](
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