geometry, an icosagon or 20-gon is a twenty-sided polygon. The sum of any icosagon's interior angles is 3240 degrees. The regular icosagon has Schläfli...

genus four, whose fundamental polygon is a regular hyperbolic twenty-sided icosagon, with an area equal to 12 π {\displaystyle 12\pi } by the Gauss-Bonnet...

Heptadecagon – 17 sides Octadecagon – 18 sides Enneadecagon – 19 sides Icosagon – 20 sides Icosikaihenagon - 21 sides Icosikaidigon - 22 sides Icositrigon...

right-hand (卐). The compact swastika can be seen as a chiral irregular icosagon (20-sided polygon) with fourfold (90°) rotational symmetry. Such a swastika...

surface of genus four, with a domain that is a regular hyperbolic 20-sided icosagon. By the Gauss-Bonnet theorem, the area of this fundamental polygon is equal...

octagon, enneagon, decagon, hendecagon, dodecagon, ... enneadecagon, icosagon, triacontagon, ... chiliagon, myriagon trilogy, tetralogy, pentalogy, hexalogy...

heptakaidecagon 18 octadecagon octakaidecagon 19 enneadecagon enneakaidecagon 20 icosagon 21 icosikaihenagon icosihenagon 22 icosikaidigon icosidigon icosadigon...

number, and as such counts the number of maximal independent sets in an icosagon. There are 277 ways to tile a 3 × 8 rectangle with integer-sided squares...

octadecagon (or octakaidecagon) 18 enneadecagon (or enneakaidecagon) 19 icosagon 20 icositrigon (or icosikaitrigon) 23 The simplest polygon such that the...

stellated dodecahedron, whose fundamental polygon is a regular hyperbolic icosagon, with an area of 12 π {\displaystyle 12\pi } (by the Gauss-Bonnet theorem)...