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A parabola is the set of points that are equally distant from the focus point and the directrix. This Tab Tutor program will help you learn about the equation of a parabola and how to use it to derive the focus, vertex, and orientation. ... College-Cram.com:: College Algebra:: Conic Sections:: Equation of a Parabola...
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www.college-cram.com/study/algebra/presentations/223
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The graph wraps around this focus. The equation of a parabola can be created using a combination of distances from the focus and from a line, called the directrix, to the graph. Examples are shown below, defining a parabola and creating its equation in this manner.
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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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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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1.The distance from the point on the parabola to focus is equal to the distance to directrix. (PF = PH) ... The equation of parabola is ... If the distance of focus and directrix changes, what shape of parabola becomes? Press "+" or "-" button to consider.
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www.ies.co.jp/math/java/conics/draw_parabola/draw_parab...
www.ies.co.jp/math/java/conics/draw_parabola/draw_parabola.html
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Interactive parabola. Explore equation, formula and graph of parabola by clicking and dragging the focus or directrix. ... To change the equation and the graph of the interactive parabola below just click and drag either the point A, which is the focus, or point B, which controls 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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If we use the notation that the focus is at (0,p), where p is positive, then the equation of the parabola is y=x^2/(4 p). Some texts later say that the "general parabola" has equation y = a x^2 + b x + c. For different choices of a, b and c, as long as a is not zero, you can get a parabola that open upwards or...
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mathcentral.uregina.ca/QQ/database/QQ.09.96/michelle1.h...
mathcentral.uregina.ca/QQ/database/QQ.09.96/michelle1.html
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It is easy to find the focus of a parabola (or the three-dimensional version, a "paraboloid") from its equation. ... If you draw your coordinate axes so that the origin is at the parabola's vertex and the y-axis points in the direction toward which the parabola opens, then its equation will take the form for some constant a,
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www.math.toronto.edu/mathnet/questionCorner/parabolic.h...
www.math.toronto.edu/mathnet/questionCorner/parabolic.html
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The equation of the parabola is found using the focus and directrix. ... Parabola : Find the vertex, focus,directrix of the parabola given by equation and sketch the graph. - Find the vertex, focus,directrix of the parabola given by equation and sketch the graph. 3x+y^2 +8y+4=0...
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www.brainmass.com/homework-help/math/algebra/7209
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Find equation for parabola: focus at (11,7) and vertex at. ... This shows how to find an equation for a parabola given focus and vertex ... Parabola : Find the vertex, focus,directrix of the parabola given by equation and sketch the graph. - Find the vertex, focus,directrix of the parabola given by equation and sketch the graph.
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www.brainmass.com/homework-help/math/geometry/15039
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