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  2. Triangle inequality - Wikipedia

    en.wikipedia.org/wiki/Triangle_inequality

    The converse of the triangle inequality theorem is also true: if three real numbers are such that each is less than the sum of the others, then there exists a triangle with these numbers as its side lengths and with positive area; and if one number equals the sum of the other two, there exists a degenerate triangle (that is, with zero area ...

  3. Ono's inequality - Wikipedia

    en.wikipedia.org/wiki/Ono's_inequality

    In mathematics, Ono's inequality is a theorem about triangles in the Euclidean plane. In its original form, as conjectured by Tôda Ono (小野藤太) in 1914, the inequality is actually false; however, the statement is true for acute triangles , as shown by F. Balitrand in 1916.

  4. List of triangle inequalities - Wikipedia

    en.wikipedia.org/wiki/List_of_triangle_inequalities

    The parameters most commonly appearing in triangle inequalities are: the side lengths a, b, and c;; the semiperimeter s = (a + b + c) / 2 (half the perimeter p);; the angle measures A, B, and C of the angles of the vertices opposite the respective sides a, b, and c (with the vertices denoted with the same symbols as their angle measures);

  5. Category:Theorems about triangles - Wikipedia

    en.wikipedia.org/wiki/Category:Theorems_about...

    Download as PDF; Printable version; In other projects ... Triangle inequalities (8 P) Pages in category "Theorems about triangles" ... Stewart's theorem; Sylvester's ...

  6. Category:Triangle inequalities - Wikipedia

    en.wikipedia.org/wiki/Category:Triangle_inequalities

    Download as PDF; Printable version; ... Pages in category "Triangle inequalities" The following 8 pages are in this category, out of 8 total. ... Erdős–Mordell ...

  7. Erdős–Mordell inequality - Wikipedia

    en.wikipedia.org/wiki/Erdős–Mordell_inequality

    Erdős–Mordell inequality. Let be an arbitrary point P inside a given triangle , and let , , and be the perpendiculars from to the sides of the triangles. (If the triangle is obtuse, one of these perpendiculars may cross through a different side of the triangle and end on the line supporting one of the sides.)

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