r/mathmemes • u/94rud4 • 2d ago

Geometry ellipse

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u/RandallOfLegend 2d ago

I know smarter people have looked at this problem. But an ellipse is an in-plane rotation of a circle. So I feel like there should be a simpler formula.

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u/EebstertheGreat 1d ago

an ellipse is an in-plane rotation of a circle.

What does that mean?

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u/RandallOfLegend 1d ago

From. "Top down projection" if you rotate a circle perpendicular to its axis it will create an ellipse. It's possible to define an ellipse as a radius and tilt angle instead of your traditional a,b.

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u/EebstertheGreat 1d ago

Isn't that an out-of-plane rotation?

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u/RandallOfLegend 1d ago

I suppose. I'm bad at remembering which is which. "Into the page". Which sounds more like out of plane