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I glanced at a few sites hit with Google, but didn't see
anything particularly simple to do this, so I'll ask here.
I have an ellipse, of which I know its centre point (0,0)
and its major and minor axes (looks a lot like a nonuniform
scaled cylinder ^_^ )...I want to find its foci (well, only
one of 'em, but if I know one I have the other). Is there
a quick formula for doing this with the given data, or do I
have to try to remember more than the most fundamental
aspects of my mathematical education?
--
Tim Cook
http://home.bellsouth.net/p/PWP-empyrean
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GFA dpu- s: a?-- C++(++++) U P? L E--- W++(+++)>$
N++ o? K- w(+) O? M-(--) V? PS+(+++) PE(--) Y(--)
PGP-(--) t* 5++>+++++ X+ R* tv+ b++(+++) DI
D++(---) G(++) e*>++ h+ !r--- !y--
------END GEEK CODE BLOCK------
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On Wed, 29 Oct 2003 03:31:18 -0500, Tim Cook <z99### [at] bellsouth net> wrote:
> I glanced at a few sites hit with Google, but didn't see
> anything particularly simple to do this, so I'll ask here.
> I have an ellipse, of which I know its centre point (0,0)
> and its major and minor axes (looks a lot like a nonuniform
> scaled cylinder ^_^ )...I want to find its foci (well, only
> one of 'em, but if I know one I have the other). Is there
> a quick formula for doing this with the given data, or do I
> have to try to remember more than the most fundamental
> aspects of my mathematical education?
If I understand what you are looking for correctly, I see answer in first
entry of http://www.google.com/search?q=finding+foci+ellipse :-)
ABX
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ABX wrote:
> If I understand what you are looking for correctly, I see answer in first
> entry of http://www.google.com/search?q=finding+foci+ellipse :-)
hmm guess that's a bit more useful than just googling for 'ellipse'
^_^;;
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Tim Cook wrote:..
> I glanced at a few sites hit with Google, but didn't see
> anything particularly simple to do this, so I'll ask here.
> I have an ellipse, of which I know its centre point (0,0)
> and its major and minor axes (looks a lot like a nonuniform
> scaled cylinder ^_^ )...I want to find its foci (well, only
> one of 'em, but if I know one I have the other). Is there
> a quick formula for doing this with the given data, or do I
> have to try to remember more than the most fundamental
> aspects of my mathematical education?
>
1. draw both axes op the ellipse
2. draw a circle centered at one end point of the small axis with a
radius equal to the length of half the large axis.
3. the intersection points of this circle and the larger axis are the
foci of the ellipse.
Herman
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HermanS wrote:
> 1. draw both axes op the ellipse
> 2. draw a circle centered at one end point of the small axis with a
> radius equal to the length of half the large axis.
> 3. the intersection points of this circle and the larger axis are the
> foci of the ellipse.
...
Whoah! That's cool! ^_^
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