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  2. Pyramid scheme - Wikipedia

    en.wikipedia.org/wiki/Pyramid_scheme

    The pyramid scheme in the picture in contrast is a geometric progression 1 + 2 + 4 + 8 = 15. Many pyramids are more sophisticated than the simple model. These recognize that recruiting a large number of others into a scheme can be difficult, so a seemingly simpler model is used.

  3. File:Pyramid scheme diagram.svg - Wikipedia

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

    The following other wikis use this file: Usage on en.wiktionary.org pyramid scheme; püramiidskeem; Usage on pt.wikipedia.org Esquema em pirâmide; Usage on simple.wikipedia.org Pyramid scheme; Usage on sq.wikipedia.org Skema piramidale; Usage on zh.wikipedia.org 層壓式推銷

  4. Pyramid (geometry) - Wikipedia

    en.wikipedia.org/wiki/Pyramid_(geometry)

    The base regularity of a pyramid's base may be classified based on the type of polygon: one example is the star pyramid in which its base is the regular star polygon. [28] The truncated pyramid is a pyramid cut off by a plane; if the truncation plane is parallel to the base of a pyramid, it is called a frustum.

  5. Chain letter - Wikipedia

    en.wikipedia.org/wiki/Chain_letter

    The "chain" is an exponentially growing pyramid (a tree graph) that cannot be sustained indefinitely. Common methods used in chain letters include emotionally manipulative stories, get-rich-quick pyramid schemes , and the exploitation of superstition to threaten the recipient.

  6. Solid modeling - Wikipedia

    en.wikipedia.org/wiki/Solid_modeling

    This forces modern geometric modeling systems to maintain several representation schemes of solids and also facilitate efficient conversion between representation schemes. Below is a list of techniques used to create or represent solid models. [4] Modern modeling software may use a combination of these schemes to represent a solid.

  7. File:Pyramid scheme.svg - Wikipedia

    en.wikipedia.org/wiki/File:Pyramid_scheme.svg

    The following other wikis use this file: Usage on az.wikipedia.org Piramida sxemi; Usage on be-tarask.wikipedia.org Фінансавая піраміда

  8. Square pyramid - Wikipedia

    en.wikipedia.org/wiki/Square_pyramid

    In geometry, a square pyramid is a pyramid with a square base and four triangles, having a total of five faces. If the apex of the pyramid is directly above the center of the square, it is a right square pyramid with four isosceles triangles ; otherwise, it is an oblique square pyramid .

  9. Airplane game - Wikipedia

    en.wikipedia.org/wiki/Airplane_game

    The "Captain" (blue) is paid when 8 "passengers" have arrived at the bottom of the pyramid. (Below the Captain are two "Co-Pilots", below them four "Crew".) The airplane game , also known as the plane game , is a style of pyramid scheme first recorded in the 1980s in North America and later Western Europe.