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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