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Topic: how calculate chord length of ellipse.
Replies: 1   Last Post: Feb 1, 2010 10:54 AM

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Dan Cass

Posts: 442
Registered: 12/6/04
Re: how calculate chord length of ellipse.
Posted: Feb 1, 2010 10:54 AM
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> An ellipse
> major axis: 900
> minor axis: 450
> Two points on ellipse 150 and 250 distance
> away from center line as shown in attached file.
> Then how to measure the lenght of chord AB as shown
> in
> attached file ?

Equation of ellipse:
x^2/900^2 + y^2/450^2 = 1.
Solve for y>0, get y=g(x).
Then your chord has endpoints
(150,g(150)) and (250,g(250)).
Now put these two points into the distance formula.

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