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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".
hendecagram, with eleven edges; dodecagram, with twelve edges; icositetragram, with twenty four edges; 257-gram, with two hundred and fifty seven edges; See also.
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]
For example, a nine-pointed polygon or enneagram is also known as a nonagram, using the ordinal nona from Latin. [citation needed] The -gram suffix derives from γραμμή (grammḗ), meaning a line. [3] The name star polygon reflects the resemblance of these shapes to the diffraction spikes of real 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
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).
Enjoy a classic game of Hearts and watch out for the Queen of Spades!
A polytope is a geometric object with flat sides, which exists in any general number of dimensions. The following list of polygons, polyhedra and polytopes gives the names of various classes of polytopes and lists some specific examples.
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