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In geometry, a hendecagon (also undecagon [1] [2] or endecagon [3]) or 11-gon is an eleven-sided polygon. (The name hendecagon , from Greek hendeka "eleven" and –gon "corner", is often preferred to the hybrid undecagon , whose first part is formed from Latin undecim "eleven".
The star in this scroll is not one of the regular forms of the hendecagram, but instead uses lines that connect the vertices of a hendecagon to nearly-opposite midpoints of the hendecagon's edges. [ 8 ] 11-pointed star Girih patterns are also used on the exterior of the Momine Khatun Mausoleum ; Eric Broug writes that its pattern "can be ...
Individual polygons are named (and sometimes classified) according to the number of sides, combining a Greek-derived numerical prefix with the suffix -gon, e.g. pentagon, dodecagon. The triangle, quadrilateral and nonagon are exceptions, although the regular forms trigon, tetragon, and enneagon are sometimes encountered as well.
Elliot Benjamin and Chip Snyder discovered in 2014 that the regular hendecagon (11-gon) is neusis constructible; the remaining cases are still open. [ 3 ] An icositrigon is not origami constructible either, because 23 is not a Pierpont prime, nor a power of two or three . [ 4 ]
11-cell, 57-cell Regular star 4-polytope Icosahedral 120-cell , Small stellated 120-cell , Great 120-cell , Grand 120-cell , Great stellated 120-cell , Grand stellated 120-cell , Great grand 120-cell , Great icosahedral 120-cell , Grand 600-cell , Great grand stellated 120-cell
Today's spangram answer on Wednesday, December 11, 2024, is WOODWORKING. What Are Today’s NYT Strands Answers, Word List for Wednesday, December 11? SANDER. PLANE. CHISEL. JIGSAW. LATHE.
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A triangle with a hendecagon (11-gon) yields a 13.2-gon, a square with a heptagon (7-gon) yields a 9.3333-gon, and a pentagon with a hexagon yields a 7.5-gon). Hence there are 1 ( 1 ) + ( 1 ( 2 ) + 1 ) + ( 3 ( 2 ) + 1 ) + 10 = 21 {\displaystyle 1(1)+(1(2)+1)+(3(2)+1)+10=21} combinations of regular polygons which meet at a vertex.