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Let's observe the phenomena that the parallel beams reflect on the parabola face and gather at one point. The point is the focus of parabola. And,investigate the relation between the position of the focus and the shape of the parabola.
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www.ies.co.jp/math/java/conics/focus/focus.html
www.ies.co.jp/math/java/conics/focus/focus.html
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Lesson 3: Find the equation of our parabola when we are given the coordinates of its focus and vertex. ... Lesson 4: Find the vertex, focus, and directrix, and graph a parabola by first completing the square.
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jwilson.coe.uga.edu/emt725/Class/Sarfaty/EMT669/Instruc...
jwilson.coe.uga.edu/emt725/Class/Sarfaty/EMT669/InstructionalUnit/Parabolas/parabolas.html
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Find the focus of a parabolic dish antenna. ... We first write the equation of the parabola so that the focal distance (distance from vertex to focus) appears in the equation. The figure below shows a parabola, its focus F at (0,f) and its directrix at y = -f. We now use the definition of the parabola.
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www.analyzemath.com/parabola/parabola_focus.html
www.analyzemath.com/parabola/parabola_focus.html
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Parabola - Wikipedia, the free encyclopedia
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In mathematics, the parabola (pronounced /pəˈræbələ/ , from the Greek παραβολή ) is a conic section, the intersection of a right circular conical surface and a plane parallel to a generating...
en.wikipedia.org/wiki/Parabola
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Interactive parabola. Explore equation, formula and graph of parabola by clicking and dragging the focus or directrix. ... A parabola is actually a locus of a point and a line. The point is called the focus and the line the directrix. That means that all points on a parabola are equidistant from the focus and the directrix.
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www.mathwarehouse.com/quadratic/parabola/interactive-pa...
www.mathwarehouse.com/quadratic/parabola/interactive-parabola.php
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English: Parabola showing relation between the focus, directrix, and a point on the curve. ... File:Parabola showing focus and reflective property.png ... Usage of Parabola focus directrix.svg on enwiki...
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commons.wikimedia.org/wiki/File:Parabola_focus_directri...
commons.wikimedia.org/wiki/File:Parabola_focus_directrix.svg
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A parabola, showing arbitrary line (L), focus (F), and vertex (V). ... In case this is not legally possible: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. ... Usage of Parabola with focus and arbitrary line.svg on enwiki...
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commons.wikimedia.org/wiki/File:Parabola_with_focus_and...
commons.wikimedia.org/wiki/File:Parabola_with_focus_and_arbitrary_line.svg
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File Name: parabola_42282; Description: Illustration of a parabola - a curve which is the locus of a point that moves in a plane so that its distance from a fixed point (focus) in the plane is always equal to its distance from a fixed line (directrix) in the plane.
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etc.usf.edu/clipart/42200/42282/parabola_42282.htm
etc.usf.edu/clipart/42200/42282/parabola_42282.htm
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The ellipse and the hyperbola are often defined using two points, each of which is called a focus. The combined distances from these foci is used to create an equation of the ellipse and hyperbola. A parabola has one focus point.
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www.algebralab.org/lessons/lesson.aspx?file=Algebra_con...
www.algebralab.org/lessons/lesson.aspx?file=Algebra_conics_directrix.xml
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