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  2. Inscribed square in a triangle - Wikipedia

    en.wikipedia.org/wiki/Inscribed_square_in_a_triangle

    It follows from this formula that, for any two inscribed squares in a triangle, the square that lies on the longer side of the triangle will have smaller area. [5] In an acute triangle, the three inscribed squares have side lengths that are all within a factor of 2 3 2 ≈ 0.94 {\displaystyle {\frac {2}{3}}{\sqrt {2}}\approx 0.94} of each other.

  3. Incircle and excircles - Wikipedia

    en.wikipedia.org/wiki/Incircle_and_excircles

    In geometry, the incircle or inscribed circle of a triangle is the largest circle that can be contained in the triangle; it touches (is tangent to) the three sides. The center of the incircle is a triangle center called the triangle's incenter .

  4. Fagnano's problem - Wikipedia

    en.wikipedia.org/wiki/Fagnano's_problem

    In geometry, Fagnano's problem is an optimization problem that was first stated by Giovanni Fagnano in 1775: For a given acute triangle determine the inscribed triangle of minimal perimeter. The solution is the orthic triangle, with vertices at the base points of the altitudes of the given triangle.

  5. Inscribed figure - Wikipedia

    en.wikipedia.org/wiki/Inscribed_figure

    Inscribed circles of various polygons An inscribed triangle of a circle A tetrahedron (red) inscribed in a cube (yellow) which is, in turn, inscribed in a rhombic triacontahedron (grey). (Click here for rotating model) In geometry, an inscribed planar shape or solid is one that is enclosed by and "fits snugly" inside another geometric shape or ...

  6. Thales's theorem - Wikipedia

    en.wikipedia.org/wiki/Thales's_theorem

    In geometry, Thales's theorem states that if A, B, and C are distinct points on a circle where the line AC is a diameter, the angle ∠ ABC is a right angle. Thales's theorem is a special case of the inscribed angle theorem and is mentioned and proved as part of the 31st proposition in the third book of Euclid's Elements. [1]

  7. Triangle center - Wikipedia

    en.wikipedia.org/wiki/Triangle_center

    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. For example, the centroid , circumcenter , incenter and orthocenter were familiar to the ancient Greeks , and can be obtained by simple constructions .