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- Director_circle abstract "In geometry, the director circle of an ellipse or hyperbola (also called the orthoptic circle or Fermat–Apollonius circle) is a circle formed by the points where two perpendicular tangent lines to the curve cross.".
- Director_circle thumbnail Fermat-Apollonius_circle.svg?width=300.
- Director_circle wikiPageID "25043024".
- Director_circle wikiPageRevisionID "603752572".
- Director_circle hasPhotoCollection Director_circle.
- Director_circle subject Category:Circles.
- Director_circle subject Category:Conic_sections.
- Director_circle type Abstraction100002137.
- Director_circle type Attribute100024264.
- Director_circle type Circle113873502.
- Director_circle type Circles.
- Director_circle type ConicSection113872975.
- Director_circle type ConicSections.
- Director_circle type Ellipse113878306.
- Director_circle type Figure113862780.
- Director_circle type PlaneFigure113863186.
- Director_circle type Shape100027807.
- Director_circle comment "In geometry, the director circle of an ellipse or hyperbola (also called the orthoptic circle or Fermat–Apollonius circle) is a circle formed by the points where two perpendicular tangent lines to the curve cross.".
- Director_circle label "Director circle".
- Director_circle sameAs m.09gk4yx.
- Director_circle sameAs Q5280532.
- Director_circle sameAs Q5280532.
- Director_circle sameAs Director_circle.
- Director_circle wasDerivedFrom Director_circle?oldid=603752572.
- Director_circle depiction Fermat-Apollonius_circle.svg.
- Director_circle isPrimaryTopicOf Director_circle.
