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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...

    Date/Time Thumbnail Dimensions User Comment; current: 14:48, 24 January 2022: 904 × 581 (112 KB): Belbury: Uploaded a work by Security and Exchange commission, U.S. Federal Govt.<br/>This vector version by {{U|Mysid}} from Vectorized from Image:PyramidSchemeMS.jpg, and removed one phrase to make less US-centric. with UploadWizard

  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. Kepler triangle - Wikipedia

    en.wikipedia.org/wiki/Kepler_triangle

    According to some authors, a "golden pyramid" with a doubled Kepler triangle as its cross-section accurately describes the design of Egyptian pyramids such as the Great Pyramid of Giza; one source of this theory is a 19th-century misreading of Herodotus by pyramidologist John Taylor.

  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. Tetrahedral number - Wikipedia

    en.wikipedia.org/wiki/Tetrahedral_number

    A pyramid with side length 5 contains 35 spheres. Each layer represents one of the first five triangular numbers. A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and three sides, called a tetrahedron.

  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.