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Ellipse

Given an ellipse, could you please explain AND show on a piece of paper exactly why the distance between the origin and vertex equals a? Please don't just show me how to derive the equation for an ellipse. I have that. And please don't just draw a picture without explaining it. Thanks!

Solution Summary

This solution is comprised of a detailed explanation to show on a piece of paper exactly why the distance between the origin and vertex equals a

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