Talk:Parabola

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Revision as of 19:16, 17 March 2010 by imported>Peter Schmitt (→‎Diagram: yes, probably not correct, and explaining nothing)
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 Definition:  The planar curve formed by the points that lie as far from a given line (the directrix) as from a given point (the focus). [d] [e]
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 Workgroup category:  Mathematics [Categories OK]
 Talk Archive:  none  English language variant:  British English

I'll be adding the more familiar equation-based description next. --Holger Kley 02:00, 10 December 2007 (CST)

Diagram

I wonder whether the diagram really depicts a parabola. It seems as if the two branches ultimately are parallel to the y-axis. Compare with:

CC Image

--Paul Wormer 16:48, 16 March 2010 (UTC)--Peter Schmitt 01:16, 18 March 2010 (UTC)

Indeed, it looks more like half of an ellipses. And even if it were drawn correctly, it does not illustrate any of the properties of a parabola. --Peter Schmitt 01:16, 18 March 2010 (UTC)
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