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Points around an Ellipse
Given an ellipse with semimajor axis and semiminor axis , what is the locus of points in the plane of the ellipse such that there are two perpendicular tangents from to the ellipse? The answer is a circle of radius as illustrated in this Demonstration.




"Points around an Ellipse" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/PointsAroundAnEllipse/
Contributed by: John Snyder
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