1. [OT] Geometry, finding foci
- Posted by gertie at visionsix.com
Jan 15, 2003
Given a ellipse, with known min and max distances across it, how do i
determine the locations of the foci?
Kat
2. Re: [OT] Geometry, finding foci
- Posted by r.schr at t-online.de
Jan 15, 2003
gertie at visionsix.com wrote:
> Given a ellipse, with known min and max distances across it, how do i
> determine the locations of the foci?
Let' name the half large axis call a, the small half axis call b.
Then a*sqrt( 1 - b*b/(a*a)) is the distance of the two foci from the
center of the ellipse on the large axis.
Have a nice day, Rolf
3. Re: [OT] Geometry, finding foci
On Wed, 15 Jan 2003 13:48:40 -0600, gertie at visionsix.com wrote:
>
>
>Given a ellipse, with known min and max distances across it, how do i=20
>determine the locations of the foci?=20
Using Pythagoras, the distance between the foci is given by:
f=3Dsqrt(power(w,2)-power(h,2))
where w and h are the overall width and height respectively. w>h.
Pete
4. Re: [OT] Geometry, finding foci
- Posted by gertie at visionsix.com
Jan 19, 2003
On 15 Jan 2003, at 21:25, r.schr at t-online.de wrote:
(and
On 15 Jan 2003, at 20:35, Pete Lomax wrote:
other things)
about the Ellipse problem.
Thanks Rolf and Pete. You guys make it look so easy, i'm jealous.
Kat
