Problems on Circles XI: Perpendicular Tangents to an Ellipse
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Draw the tangent to a point on an ellipse and the two tangents that are perpendicular to it. The locus of the intersection points of these lines is a circle.
Contributed by: Jaime Rangel-Mondragon (March 2011)
Open content licensed under CC BY-NC-SA
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"Problems on Circles XI: Perpendicular Tangents to an Ellipse"
http://demonstrations.wolfram.com/ProblemsOnCirclesXIPerpendicularTangentsToAnEllipse/
Wolfram Demonstrations Project
Published: March 7 2011