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The regular octadecagon has Dih 18 symmetry, order 36. There are 5 subgroup dihedral symmetries: Dih 9, (Dih 6, Dih 3), and (Dih 2 Dih 1), and 6 cyclic group symmetries: (Z 18, Z 9), (Z 6, Z 3), and (Z 2, Z 1). These 15 symmetries can be seen in 12 distinct symmetries on the octadecagon. John Conway labels these by a letter and group order. [4]
Octadecagon – 18 sides; Enneadecagon – 19 sides; Icosagon – 20 sides; Icosikaihenagon - 21 sides; Icosikaidigon - 22 sides; Icositrigon - 23 sides; Icositetragon - 24 sides; Icosikaipentagon - 25 sides; Icosikaihexagon - 26 sides; Icosikaiheptagon - 27 sides; Icosikaioctagon - 28 sides; Icosikaienneagon - 29 sides; Triacontagon - 30 sides ...
In geometry, an octagon (from Ancient Greek ὀκτάγωνον (oktágōnon) 'eight angles') is an eight-sided polygon or 8-gon.. A regular octagon has Schläfli symbol {8} [1] and can also be constructed as a quasiregular truncated square, t{4}, which alternates two types of edges.
Regular polyhedron. Platonic solid: . Tetrahedron, Cube, Octahedron, Dodecahedron, Icosahedron; Regular spherical polyhedron. Dihedron, Hosohedron; Kepler–Poinsot ...
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A pentagon is a five-sided polygon. A regular pentagon has 5 equal edges and 5 equal angles. In geometry, a polygon is traditionally a plane figure that is bounded by a finite chain of straight line segments closing in a loop to form a closed chain.
Table of Shapes Section Sub-Section Sup-Section Name Algebraic Curves ¿ Curves ¿ Curves: Cubic Plane Curve: Quartic Plane Curve: Rational Curves: Degree 2: Conic Section(s) Unit Circle: Unit Hyperbola: Degree 3: Folium of Descartes: Cissoid of Diocles: Conchoid of de Sluze: Right Strophoid: Semicubical Parabola: Serpentine Curve: Trident ...
The polytopes of rank 2 (2-polytopes) are called polygons.Regular polygons are equilateral and cyclic.A p-gonal regular polygon is represented by Schläfli symbol {p}.. Many sources only consider convex polygons, but star polygons, like the pentagram, when considered, can also be regular.