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  2. File:Quadrilateral hierarchy svg.svg - Wikipedia

    en.wikipedia.org/wiki/File:Quadrilateral...

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

  3. Nested set collection - Wikipedia

    en.wikipedia.org/wiki/Nested_set_collection

    A square can always also be referred to as a quadrilateral, polygon or shape. In this way, it is a hierarchy. However, consider the set of polygons using this classification. A square can only be a quadrilateral; it can never be a triangle, hexagon, etc. Nested hierarchies are the organizational schemes behind taxonomies and systematic ...

  4. Hierarchy - Wikipedia

    en.wikipedia.org/wiki/Hierarchy

    Maslow's hierarchy of human needs. This is an example of a hierarchy visualized with a triangle diagram. The hierarchical aspect represented here is that needs at lower levels of the pyramid are considered more basic and must be fulfilled before higher ones are met.

  5. Quadrilateral - Wikipedia

    en.wikipedia.org/wiki/Quadrilateral

    A quadric quadrilateral is a convex quadrilateral whose four vertices all lie on the perimeter of a square. [7] A diametric quadrilateral is a cyclic quadrilateral having one of its sides as a diameter of the circumcircle. [8] A Hjelmslev quadrilateral is a quadrilateral with two right angles at opposite vertices. [9]

  6. Vowel diagram - Wikipedia

    en.wikipedia.org/wiki/Vowel_diagram

    Only 10% of languages, including English, have a vowel diagram that is quadrilateral. Such a diagram is called a vowel quadrilateral or a vowel trapezium. [2] Different vowels vary in pitch. For example, high vowels, such as [i] and [u], tend to have a higher fundamental frequency than low vowels, such as [a]. Vowels are distinct from one ...

  7. Tree structure - Wikipedia

    en.wikipedia.org/wiki/Tree_structure

    A tree structure, tree diagram, or tree model is a way of representing the hierarchical nature of a structure in a graphical form. It is named a "tree structure" because the classic representation resembles a tree, although the chart is generally upside down compared to a biological tree, with the "stem" at the top and the "leaves" at the bottom.

  8. File:Euler diagram of quadrilateral types.svg - Wikipedia

    en.wikipedia.org/wiki/File:Euler_diagram_of...

    Euler diagram of some types of quadrilaterals: Image title: Euler diagram of some types of quadrilaterals by CMG Lee. (UK) denotes British English and (US) denotes ...

  9. Voronoi diagram - Wikipedia

    en.wikipedia.org/wiki/Voronoi_diagram

    When two cells in the Voronoi diagram share a boundary, it is a line segment, ray, or line, consisting of all the points in the plane that are equidistant to their two nearest sites. The vertices of the diagram, where three or more of these boundaries meet, are the points that have three or more equally distant nearest sites.