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  2. Triangle choke - Wikipedia

    en.wikipedia.org/wiki/Triangle_choke

    The triangle choke was first shown in mixed martial arts on March 11, 1994, when Jason Delucia used a triangle to defeat Scott Baker at UFC 2. This variation has remained as the most commonly seen in MMA, although the side or inverted triangle has been also used; on September 26, 1995, Shooto fighter Rumina Sato submitted Isamu Osugi with a ...

  3. Inverse Pythagorean theorem - Wikipedia

    en.wikipedia.org/wiki/Inverse_Pythagorean_theorem

    In geometry, the inverse Pythagorean theorem (also known as the reciprocal Pythagorean theorem [1] or the upside down Pythagorean theorem [2]) is as follows: [3]. Let A, B be the endpoints of the hypotenuse of a right triangle ABC.

  4. Inversive geometry - Wikipedia

    en.wikipedia.org/wiki/Inversive_geometry

    The medial triangle of the intouch triangle is inverted into triangle ABC, meaning the circumcenter of the medial triangle, that is, the nine-point center of the intouch triangle, the incenter and circumcenter of triangle ABC are collinear. Any two non-intersecting circles may be inverted into concentric circles.

  5. Arm triangle choke - Wikipedia

    en.wikipedia.org/wiki/Arm_triangle_choke

    Arm triangle choke, side choke, or head and arm choke are generic terms describing blood chokeholds in which the opponent is strangled in between their own shoulder and the practitioner's arm. This is as opposed to the regular triangle choke , which denotes a chokehold using the legs , albeit with a similar mechanism of strangulation against ...

  6. Sierpiński triangle - Wikipedia

    en.wikipedia.org/wiki/Sierpiński_triangle

    A level-5 approximation to a Sierpiński triangle obtained by shading the first 2 5 (32) levels of a Pascal's triangle white if the binomial coefficient is even and black otherwise If one takes Pascal's triangle with 2 n {\displaystyle 2^{n}} rows and colors the even numbers white, and the odd numbers black, the result is an approximation to ...

  7. Nabla symbol - Wikipedia

    en.wikipedia.org/wiki/Nabla_symbol

    The nabla is a triangular symbol resembling an inverted Greek delta: [1] or ∇. The name comes, by reason of the symbol's shape, from the Hellenistic Greek word νάβλα for a Phoenician harp, [2] [3] and was suggested by the encyclopedist William Robertson Smith in an 1870 letter to Peter Guthrie Tait.

  8. Incircle and excircles - Wikipedia

    en.wikipedia.org/wiki/Incircle_and_excircles

    The Nagel triangle or extouch triangle of is denoted by the vertices , , and that are the three points where the excircles touch the reference and where is opposite of , etc. This T A T B T C {\displaystyle \triangle T_{A}T_{B}T_{C}} is also known as the extouch triangle of A B C {\displaystyle \triangle ABC} .

  9. Einthoven's triangle - Wikipedia

    en.wikipedia.org/wiki/Einthoven's_triangle

    Graphical representation of Einthoven's triangle. Einthoven's triangle is an imaginary formation of three limb leads in a triangle used in the electrocardiography, formed by the two shoulders and the pubis. [1] The shape forms an inverted equilateral triangle with the heart at the center. It is named after Willem Einthoven, who theorized its ...