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Everything about Orthocenter

Intersection of triangle altitudes

The orthocenter of a triangle, usually denoted by H, is the point where the three altitudes intersect. The orthocenter lies inside the triangle if and only if the triangle is acute. For a right triangle, the orthocenter coincides with the vertex at the right angle. For an equilateral triangle, all triangle centers coincide at its centroid. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: OrthocenterA 5-minute orientation
  2. Skim a recent paper: On a property of the orthocenterInfluential work since 2022
  3. Pick up a classic book: Geometrical kaleidoscopeThe most-reprinted book on the subject
  4. Read the landmark paper: Some Information Measures Based on Centroid, Orthocenter, Circumcenter and Incenter Points of Transformed Triangular Fuzzy Numbers and their ApplicationsCited 10 times
  5. Go sideways: Euler lineA closely related topic
  6. Go sideways: CircumcircleA closely related topic

📖 Definitions

Noun One of the centers (UK:centres) of a triangle, defined as being the intersection of its three altitudes; in an acute triangle, it is inside the triangle; in an obtuse triangle, it is outside the triangle; in a right-angled triangle it is the vertex opposite the hypotenuse and so is on the triangle.

🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

Ranked by number of editions on Open Library, a rough measure of how lasting a book is.

🔗 Related topics