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In triangle geometry, a triangle conic is a conic in the plane of the reference triangle and associated with it in some way. For example, the circumcircle and the incircle of the reference triangle are triangle conics. Other examples are the Steiner ellipse which is an ellipse passing through the vertices and having its centre at the centroid of the reference triangle, the Kiepert hyperbola which is a conic passing through the vertices, the centroid and the orthocentre of the reference triangle and the Artzt parabolas which are parabolas touching two sidelines of the reference triangle at vertices of the triangle. The terminology of triangle conic is widely used in the literature without a formal definition,that is, without precisely formulating the relations a conic should have with the r

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  • Triangle conic (en)
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  • In triangle geometry, a triangle conic is a conic in the plane of the reference triangle and associated with it in some way. For example, the circumcircle and the incircle of the reference triangle are triangle conics. Other examples are the Steiner ellipse which is an ellipse passing through the vertices and having its centre at the centroid of the reference triangle, the Kiepert hyperbola which is a conic passing through the vertices, the centroid and the orthocentre of the reference triangle and the Artzt parabolas which are parabolas touching two sidelines of the reference triangle at vertices of the triangle. The terminology of triangle conic is widely used in the literature without a formal definition,that is, without precisely formulating the relations a conic should have with the r (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Incircle_and_Excircles.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Kiepert_Hyperbola.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Triangle.NinePointCircle.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/ArtztParabolas.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/CircumCircleOFTriangleABC.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/EllipseOfParallelIntercepts.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Hofstadter.gif
  • http://commons.wikimedia.org/wiki/Special:FilePath/InCircleOFTriangleABC.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/JerabekHyperbolaOfTriangleABC.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/KiepertParabola.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/LemoineCircleOfTriangleABC.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/SteinerCircleOfTriangleABC.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/SteinerInellipseOfTriangleABC.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/YffConics.gif
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  • In triangle geometry, a triangle conic is a conic in the plane of the reference triangle and associated with it in some way. For example, the circumcircle and the incircle of the reference triangle are triangle conics. Other examples are the Steiner ellipse which is an ellipse passing through the vertices and having its centre at the centroid of the reference triangle, the Kiepert hyperbola which is a conic passing through the vertices, the centroid and the orthocentre of the reference triangle and the Artzt parabolas which are parabolas touching two sidelines of the reference triangle at vertices of the triangle. The terminology of triangle conic is widely used in the literature without a formal definition,that is, without precisely formulating the relations a conic should have with the reference triangle so as to qualify it to be called a triangle conic (see,). WolframMathWorld has a page titled "Triangle conics" which gives a list of 42 items (not all of them are conics) without giving a definition of triangle conic. However, Paris Pamfilos in his extensive collection of topics in geometry and topics in other fields related to geometry defines a triangle conic as a "conic circumscribing a triangle ABC (that is, passing through its vertices) or inscribed in a triangle (that is, tangent to its side-lines)". The terminology triangle circle (respectively, ellipse, hyperbola, parabola) is used to denote a circle (respectively, ellipse, hyperbola, parabola) associated with the reference triangle is some way. Even though several triangle conics have been studied individually, there is no comprehensive encyclopedia or catalogue of triangle conics similar to Karl Kimberling's Encyclopedia of Triangle Centres (which contains definitions and properties of more than 46,000 triangle centres) or Bernard Gibert's Catalog of Triangle Cubics containing detailed descriptions of more than 1200 triangle cubics. (en)
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