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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, 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
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]
hendecagram, with eleven edges; dodecagram, with twelve edges; icositetragram, with twenty four edges; 257-gram, with two hundred and fifty seven edges; See also.
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).
A regular decagram is a 10-sided polygram, represented by symbol {10/n}, containing the same vertices as regular decagon.Only one of these polygrams, {10/3} (connecting every third point), forms a regular star polygon, but there are also three ten-vertex polygrams which can be interpreted as regular compounds:
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