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  2. Hendecagram - Wikipedia

    en.wikipedia.org/wiki/Hendecagram

    In geometry, a hendecagram (also endecagram or endekagram) is a star polygon that has eleven vertices. The name hendecagram combines a Greek numeral prefix, hendeca-, with the Greek suffix -gram. The hendeca-prefix derives from Greek ἕνδεκα (ἕν + δέκα, one + ten) meaning "eleven".

  3. List of self-intersecting polygons - Wikipedia

    en.wikipedia.org/wiki/List_of_self-intersecting...

    Self-intersecting polygons, crossed polygons, or self-crossing polygons are polygons some of whose edges cross each other. They contrast with simple polygons, whose edges never cross.

  4. List of symbolic stars - Wikipedia

    en.wikipedia.org/wiki/List_of_symbolic_stars

    Hendecagram, an eleven-pointed star polygon; Dodecagram, a twelve-pointed star polygon; Magic star, a star polygon in which numbers can be placed at each of the vertices and intersections, such that the four numbers on each line sum to the same "magic" constant

  5. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/10-hard-math-problems-even-150000090...

    It stands as one of the oldest open questions in all of math. creative commons. The Twin Prime Conjecture. Together with Goldbach’s, the Twin Prime Conjecture is the most famous in Number Theory ...

  6. Polygram (geometry) - Wikipedia

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

    For example, a regular pentagram, {5/2}, has 5 sides, and the regular hexagram, {6/2} or 2{3}, has 6 sides divided into two triangles. A regular polygram { p / q } can either be in a set of regular star polygons (for gcd ( p , q ) = 1, q > 1) or in a set of regular polygon compounds (if gcd( p , q ) > 1).

  7. Regular polygon - Wikipedia

    en.wikipedia.org/wiki/Regular_polygon

    The most common example is the pentagram, which has the same vertices as a pentagon, but connects alternating vertices. For an n-sided star polygon, the Schläfli symbol is modified to indicate the density or "starriness" m of the polygon, as {n/m}. If m is 2, for example, then every second point is

  8. List of mathematical examples - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_examples

    This page will attempt to list examples in mathematics. To qualify for inclusion, an article should be about a mathematical object with a fair amount of concreteness. Usually a definition of an abstract concept, a theorem, or a proof would not be an "example" as the term should be understood here (an elegant proof of an isolated but particularly striking fact, as opposed to a proof of a ...

  9. Hendecagon - Wikipedia

    en.wikipedia.org/wiki/Hendecagon

    A regular hendecagon is represented by Schläfli symbol {11}.. A regular hendecagon has internal angles of 147. 27 degrees (=147 degrees). [5] The area of a regular hendecagon with side length a is given by [2]

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