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Focus and Directrix of a Parabola 2

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Uploaded by on Jul 14, 2009

Finding the focus and directrix of a parabola

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LICENSE: Creative Commons (Attribution-Noncommercial-No Derivative Works).

For more information about this license, please read: http://creativecommons.org/licenses/by-nc-nd/3.0/.

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Top Comments

  • "the color choosing is the hard part"

  • I wish my math teacher would teach this way instead of teaching us how to plug in numbers into formulas like a calculator :D This actually gets me interested in learning math.

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All Comments (27)

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  • the prettiest math available

  • Thank you! i never understood how until now

  • sdsdsdssd

  • sdsd

  • sdsdssssssssssssss\

    

  • ahhh makes SENSE finally xD

    thanks, Sal

  • They still leave the most important properties of the Focal Point and the Directrix of Parabolas when learning the mathematics and physics! Parallel light rays coming into a parabollic dish(mirror) reflect to a common point creating incredible energy (heat);example a solar furnace or waves coming in from a satellite would be collected on a probe holding a receier at the focal point.

    The Directrix could be illustrated in the 'Bow Wave' that appears in front of the Vortex. Why?

  • @cowfinatic101 LOL THATS WHAT I THOUGHT! >.>

  • MAGENTA!

  • and then we did A BUNCH OF ALGEBRA... and got this equation right here *points at pretty equation*

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