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  2. Triangle center - Wikipedia

    en.wikipedia.org/wiki/Triangle_center

    Altitudes (intersect at orthocenter H) Nine-point circle (centered at nine-point center N which, along with H, G, O , lies on the Euler line e ) In geometry , a triangle center or triangle centre is a point in the triangle 's plane that is in some sense in the middle of the triangle.

  3. Orthocentric system - Wikipedia

    en.wikipedia.org/wiki/Orthocentric_system

    Orthocentric system.Any point is the orthocenter of the triangle formed by the other three. In geometry, an orthocentric system is a set of four points on a plane, one of which is the orthocenter of the triangle formed by the other three.

  4. Orthocenter - Wikipedia

    en.wikipedia.org/wiki/Orthocenter

    The isogonal conjugate of the orthocenter is the circumcenter of the triangle. [10] The isotomic conjugate of the orthocenter is the symmedian point of the anticomplementary triangle. [11] Four points in the plane, such that one of them is the orthocenter of the triangle formed by the other three, is called an orthocentric system or ...

  5. Altitude (triangle) - Wikipedia

    en.wikipedia.org/wiki/Altitude_(triangle)

    The three altitudes of a triangle intersect at the orthocenter, which for an acute triangle is inside the triangle. The orthocenter of a triangle, usually denoted by H, is the point where the three (possibly extended) altitudes intersect. [1] [2] The orthocenter lies inside the triangle if and only if the triangle is acute.

  6. File:Orthocenter proof step 1.svg - Wikipedia

    en.wikipedia.org/wiki/File:Orthocenter_proof...

    This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.

  7. Encyclopedia of Triangle Centers - Wikipedia

    en.wikipedia.org/wiki/Encyclopedia_of_Triangle...

    Links to The Geometer's Sketchpad diagrams are provided for key points. The Encyclopedia also includes a glossary of terms and definitions. Each point in the list is assigned a unique name. In cases where no particular name arises from geometrical or historical considerations, the name of a star is used instead.

  8. Euler line - Wikipedia

    en.wikipedia.org/wiki/Euler_line

    In geometry, the Euler line, named after Leonhard Euler (/ ˈ ɔɪ l ər / OY-lər), is a line determined from any triangle that is not equilateral.It is a central line of the triangle, and it passes through several important points determined from the triangle, including the orthocenter, the circumcenter, the centroid, the Exeter point and the center of the nine-point circle of the triangle.

  9. File:Triangle.Orthocenter.svg - Wikipedia

    en.wikipedia.org/wiki/File:Triangle.Orthocenter.svg

    Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. Click on date to download the file or see the image uploaded on that date.

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