How to find foci of an ellipse: x^2/36+y^2/9=1 ? and plot

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Stefan Tal on 5 Jun 2021

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https://www.mathworks.com/matlabcentral/answers/848365-how-to-find-foci-of-an-ellipse-x-2-36-y-2-9-1-and-plot

Commented: Stefan Tal on 5 Jun 2021

I succeed to ezplot the ecuation but I don't know how to find foci pls help.

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Scott MacKenzie on 5 Jun 2021

Just look up "ellipse" in Wikipedia. The answer is in the first paragraph.

Stefan Tal on 5 Jun 2021

ezplot('x^2/36+y^2/9=1');

I don't know how to code for foci.

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Sulaymon Eshkabilov on 5 Jun 2021

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https://www.mathworks.com/matlabcentral/answers/848365-how-to-find-foci-of-an-ellipse-x-2-36-y-2-9-1-and-plot#answer_717205

Here is a nice discussion with codes that addresses your question.

https://www.mathworks.com/matlabcentral/answers/399328-define-an-ellipse-with-a-given-angle-and-find-if-a-point-lies-inside-its-boundaries

This source shows how to calculate foci points: https://www.emathhelp.net/calculators/algebra-2/ellipse-calculator/

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