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  2. Semicircle - Wikipedia

    en.wikipedia.org/wiki/Semicircle

    PR is the diameter of a circle centered on O; its radius AO is the arithmetic mean of a and b. Using the geometric mean theorem, triangle PGR's altitude GQ is the geometric mean. For any ratio a:b, AO ≥ GQ. A semicircle can be used to construct the arithmetic and geometric means of two lengths using straight-edge and compass.

  3. List of centroids - Wikipedia

    en.wikipedia.org/wiki/List_of_centroids

    Solid semi-ellipsoid of revolution around z-axis: a = the radius of the base circle h = the height of the semi-ellipsoid from the base cicle's center to the edge ...

  4. List of mathematical shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_shapes

    Tessellations of euclidean and hyperbolic space may also be considered regular polytopes. Note that an 'n'-dimensional polytope actually tessellates a space of one dimension less. For example, the (three-dimensional) platonic solids tessellate the 'two'-dimensional 'surface' of the sphere.

  5. Semifield - Wikipedia

    en.wikipedia.org/wiki/Semifield

    We only give examples of semifields in the second sense, i.e. additive semigroups with distributive multiplication. Moreover, addition is commutative and multiplication is associative in our examples. Positive rational numbers with the usual addition and multiplication form a commutative semifield. This can be extended by an absorbing 0.

  6. List of two-dimensional geometric shapes - Wikipedia

    en.wikipedia.org/wiki/List_of_two-dimensional...

    Star of David (example) Heptagram – star polygon with 7 sides; Octagram – star polygon with 8 sides Star of Lakshmi (example) Enneagram - star polygon with 9 sides; Decagram - star polygon with 10 sides; Hendecagram - star polygon with 11 sides; Dodecagram - star polygon with 12 sides; Apeirogon - generalized polygon with countably infinite ...

  7. Arbelos - Wikipedia

    en.wikipedia.org/wiki/Arbelos

    An arbelos (grey region) Arbelos sculpture in Kaatsheuvel, Netherlands In geometry, an arbelos is a plane region bounded by three semicircles with three apexes such that each corner of each semicircle is shared with one of the others (connected), all on the same side of a straight line (the baseline) that contains their diameters.

  8. Salinon - Wikipedia

    en.wikipedia.org/wiki/Salinon

    The salinon (red) and the circle (blue) have the same area. The salinon (meaning 'salt-cellar' in Greek) is a geometrical figure that consists of four semicircles . It was first introduced in the Book of Lemmas , a work attributed to Archimedes .

  9. Delta set - Wikipedia

    en.wikipedia.org/wiki/Delta_set

    Simplicial sets have additional structure, so that every simplicial set is also a semi-simplicial set. Three Delta-set structures on the circle, with the third also being a simplicial complex. As an example, suppose we want to triangulate the 1-dimensional circle . To do so with a simplicial complex, we need at least three vertices, and edges ...

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