what is a director circle ?
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In geometry, the director circle of an ellipse or hyperbola is a circle consisting of all points where two perpendicular tangent lines to the ellipse or hyperbola cross each other....
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the director circle of an ellipse or hyperbola (also called the orthoptic circle or Fermat–Apollonius circle) is a circleconsisting of all points where two perpendicular tangent lines to the ellipse or hyperbola cross each other
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