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  2. Modern triangle geometry - Wikipedia

    en.wikipedia.org/wiki/Modern_triangle_geometry

    A quick glance into the world of modern triangle geometry as it existed during the peak of interest in triangle geometry subsequent to the publication of Lemoine's paper is presented below. This presentation is largely based on the topics discussed in William Gallatly's book [13] published in 1910 and Roger A Johnsons' book [14] first published ...

  3. The Secrets of Triangles - Wikipedia

    en.wikipedia.org/wiki/The_Secrets_of_Triangles

    The chapter on areas includes both trigonometric formulas and Heron's formula for computing the area of a triangle from its side lengths, and the chapter on inequalities includes the Erdős–Mordell inequality on sums of distances from the sides of a triangle and Weitzenböck's inequality relating the area of a triangle to that of squares on ...

  4. Triangle - Wikipedia

    en.wikipedia.org/wiki/Triangle

    A curvilinear triangle is a shape with three curved sides, for instance, a circular triangle with circular-arc sides. (This article is about straight-sided triangles in Euclidean geometry, except where otherwise noted.) Triangles are classified into different types based on their angles and the lengths of their sides.

  5. Category:Triangle geometry - Wikipedia

    en.wikipedia.org/wiki/Category:Triangle_geometry

    Download as PDF; Printable version; In other projects Wikimedia Commons; Wikidata item; Appearance. move to sidebar hide. Help ... Pages in category "Triangle geometry"

  6. Category:Theorems about triangles - Wikipedia

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

    Download as PDF; Printable version; In other projects ... Pages in category "Theorems about triangles" ... (geometry) Menelaus's theorem;

  7. Similarity (geometry) - Wikipedia

    en.wikipedia.org/wiki/Similarity_(geometry)

    There are several elementary results concerning similar triangles in Euclidean geometry: [9] Any two equilateral triangles are similar. Two triangles, both similar to a third triangle, are similar to each other (transitivity of similarity of triangles). Corresponding altitudes of similar triangles have the same ratio as the corresponding sides.

  8. Category:Triangles - Wikipedia

    en.wikipedia.org/wiki/Category:Triangles

    Download as PDF; Printable version; ... Note that this category is for specific triangles or types of triangles. ... Triangle geometry (7 C, 39 P) Triangles of ...

  9. Heron's formula - Wikipedia

    en.wikipedia.org/wiki/Heron's_formula

    A triangle with sides a, b, and c. In geometry, Heron's formula (or Hero's formula) gives the area of a triangle in terms of the three side lengths ⁠, ⁠ ⁠, ⁠ ⁠. ⁠ Letting ⁠ ⁠ be the semiperimeter of the triangle, = (+ +), the area ⁠ ⁠ is [1]