In this video I go over another example on conic sections and ellipses, and this time look at determining the equation of an ellipse when we are given the foci (plural for focus) and the vertices. In this particular example, since the foci (0 , +/- 2) and vertices (0 , +/- 3) are on the y-axis, we obtain a vertical ellipse. Thus we use the formula for an ellipse that involves the a^2 term below the y^2 term: x^2/b^2 + y^2/a^2 = 1. Then all we need to use the definition of b^2 = a^2 – c^2 from my derivation video for ellipses, to get b^2 = 5. Note that b corresponds to the end points on the minor axis of the ellipses, whereas the vertices correspond to the end points on the major axis. From here we get the ellipse x^2/5 + y^2/9 = 1 or 9x^2 + 5y^2 = 45. This is a simple but very detailed look at determining the equation of a vertical or inverted ellipse so make sure to watch this video!
Download the notes in my video: https://1drv.ms/b/s!As32ynv0LoaIhvlL0Dro9YGOWlSH2g
View Video Notes on Steemit: https://steemit.com/mathematics/@mes/video-notes-conic-sections-ellipses-example-2-vertical-ellipse
Related Videos:
Conic Sections: Ellipses: Example 1:
Conic Sections: Ellipses: Definition and Derivation of Formula (Including Circles):
Conic Sections: Parabolas: Definition and Formula:
Ellipses: Definition and Proof of Equation:
Inverted Ellipses:
Equation of a Circle and it's proof: .
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I don't always derive the equation of an ellipse but when I do I'm usually given the foci and vertices, and it's usually vertical ;)
View Video Notes: https://steemit.com/mathematics/@mes/video-notes-conic-sections-ellipses-example-2-vertical-ellipse
I can only sigh at the degree of computations here; it is said that numbers and math are but windows to the very fabric of life as God intend it to be. Thanks for these my dear friend.
Ellipses are, by their nature not "perfectly round" in the technical sense that circles are round. And very well explained by video.
Thanks for share ....
keep posting ....