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  2. American death triangle - Wikipedia

    en.wikipedia.org/wiki/American_death_triangle

    The American Death Triangle, also known as the "American Triangle", [1] "Triangle Anchor" [2] or simply the "Death Triangle", is a dangerous type of rock and ice climbing anchor infamous for both magnifying load forces on fixed anchors and lack of redundancy in attachment to the anchor.

  3. Coordinate system - Wikipedia

    en.wikipedia.org/wiki/Coordinate_system

    Barycentric coordinate system as used for ternary plots and more generally in the analysis of triangles. Trilinear coordinates are used in the context of triangles. There are ways of describing curves without coordinates, using intrinsic equations that use invariant quantities such as curvature and arc length. These include:

  4. Schwarz triangle - Wikipedia

    en.wikipedia.org/wiki/Schwarz_triangle

    Each Schwarz triangle on a sphere defines a finite group, while on the Euclidean or hyperbolic plane they define an infinite group. A Schwarz triangle is represented by three rational numbers (p q r), each representing the angle at a vertex. The value n ⁄ d means the vertex angle is d ⁄ n of the half-circle.

  5. Surface (topology) - Wikipedia

    en.wikipedia.org/wiki/Surface_(topology)

    These homeomorphisms are also known as (coordinate) charts. The boundary of the upper half-plane is the x-axis. A point on the surface mapped via a chart to the x-axis is termed a boundary point. The collection of such points is known as the boundary of the surface which is necessarily a one-manifold, that is, the union of closed curves.

  6. Special right triangle - Wikipedia

    en.wikipedia.org/wiki/Special_right_triangle

    Set square shaped as 45° - 45° - 90° triangle The side lengths of a 45° - 45° - 90° triangle 45° - 45° - 90° right triangle of hypotenuse length 1.. In plane geometry, dividing a square along its diagonal results in two isosceles right triangles, each with one right angle (90°, ⁠ π / 2 ⁠ radians) and two other congruent angles each measuring half of a right angle (45°, or ...

  7. Triangulated category - Wikipedia

    en.wikipedia.org/wiki/Triangulated_category

    A triangulated category is an additive category D with a translation functor and a class of triangles, called exact triangles [2] (or distinguished triangles), satisfying the following properties (TR 1), (TR 2), (TR 3) and (TR 4). (These axioms are not entirely independent, since (TR 3) can be derived from the others.

  8. These are the pedophile symbols you need to know to protect ...

    www.aol.com/news/2016-04-26-these-are-the...

    In March, a mother was horrified to find a pedophile symbol on a toy she bought for her daughter. Although the symbol was not intentionally placed on the toy by the company who manufactured the ...

  9. Category:Types of triangles - Wikipedia

    en.wikipedia.org/wiki/Category:Types_of_triangles

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