In geometry, a dodecagon, or 12-gon, is any twelve-sided polygon. 展开

As 12 = 2 × 3, regular dodecagon is constructible using compass-and-straightedge construction: 展开

Coxeter states that every zonogon (a 2m-gon whose opposite sides are parallel and of equal length) can be dissected into m(m-1)/2 parallelograms. In particular this is true for regular polygons … 展开

In block capitals, the letters E, H and X (and I in a slab serif font) have dodecagonal outlines. A cross is a dodecagon, as is the logo … 展开

A regular dodecagon is a figure with sides of the same length and internal angles of the same size. It has twelve lines of reflective symmetry and rotational symmetry of order 12. A regular dodecagon is represented by the Schläfli symbol {12} … 展开

A skew dodecagon is a skew polygon with 12 vertices and edges but not existing on the same plane. The interior of such a dodecagon is not generally defined. A skew zig-zag dodecagon has vertices alternating between two parallel planes.
A regular … 展开

• Dodecagonal number
• Dodecahedron – any polyhedron with 12 faces.
• Dodecagram 展开