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  2. Triangle (musical instrument) - Wikipedia

    en.wikipedia.org/wiki/Triangle_(musical_instrument)

    111.211 Individual percussion sticks. The triangle is a musical instrument in the percussion family, classified as an idiophone in the Hornbostel-Sachs classification system. Triangles are made from a variety of metals including aluminum, beryllium copper, brass, bronze, iron, and steel. The metal is bent into a triangular shape with one open end.

  3. Dayton Triangles - Wikipedia

    en.wikipedia.org/wiki/Dayton_Triangles

    The Dayton Triangles were an original franchise of the American Professional Football Association (now the National Football League (NFL)) in 1920. The Triangles were based in Dayton, Ohio, and took their nickname from their home field, Triangle Park, which was located at the confluence of the Great Miami and Stillwater Rivers in north Dayton.

  4. Pattern Blocks - Wikipedia

    en.wikipedia.org/wiki/Pattern_blocks

    Pattern Blocks are a set of mathematical manipulatives developed in the 1960s. The six shapes are both a play resource and a tool for learning in mathematics, which serve to develop spatial reasoning skills that are fundamental to the learning of mathematics. Among other things, they allow children to see how shapes can be composed and ...

  5. Triangle - Wikipedia

    en.wikipedia.org/wiki/Triangle

    A triangle with one interior angle measuring more than 90° is an obtuse triangle or obtuse-angled triangle. If c is the length of the longest side, then a 2 + b 2 < c 2, where a and b are the lengths of the other sides. A triangle with an interior angle of 180° (and collinear vertices) is degenerate. A right degenerate triangle has collinear ...

  6. Rack (billiards) - Wikipedia

    en.wikipedia.org/wiki/Rack_(billiards)

    Rack (billiards) A rack (sometimes called a triangle) is a piece of equipment that is used to place billiard balls in their starting positions at the beginning of a pocket billiards game. Rack may also be used as a verb to describe the act of setting billiard balls in their starting positions (e.g. "to rack the balls"), or as a noun to describe ...

  7. Spherical geometry - Wikipedia

    en.wikipedia.org/wiki/Spherical_geometry

    In a small triangle on the face of the earth, the sum of the angles is only slightly more than 180 degrees. A sphere with a spherical triangle on it. Spherical geometry or spherics (from Ancient Greek σφαιρικά) is the geometry of the two- dimensional surface of a sphere [a] or the n -dimensional surface of higher dimensional spheres .

  8. Narcissistic Triangulation: Defintion, Examples, How to Respond

    www.healthline.com/health/narcissistic-triangulation

    Triangulation happens when one or both of the people involved in the conflict try to pull a third person into the dynamic, often with the goal of: deflecting some of the tension. creating another ...

  9. Triominoes - Wikipedia

    en.wikipedia.org/wiki/Triominoes

    Triominoes. A game of Triominoes. Note how adjacent tiles are placed with matching corner values, and note the completed hexagon of six tiles (with corner values of 1 at the center). There are two uncompleted hexagons of five tiles, also with corner values of 1 at the center. One could be completed with the 1-1-3 tile, and the other cannot be ...

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