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dodecagon
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In geometry, a dodecagon, or 12-gon, is any twelve-sided polygon.
~9 min read
Encyclopedic overview
15 sectionsContents
- Regular dodecagon
- Area
- Perimeter
- Dodecagon construction
- Dissection
- Symmetry
- Occurrence
- Tiling
- Skew dodecagon
- Petrie polygons
- Related figures
- Examples in use
- See also
- Notes
- External links
In geometry, a dodecagon, or 12-gon, is any twelve-sided polygon.
==Regular dodecagon== thumb|upright=1.5|Three squares of sides R can be cut and rearranged into a dodecagon of circumscribed circle|circumradius R, yielding a that its area is 3R2 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} and can be constructed as a truncated hexagon, t{6}, or a twice-truncated triangle, tt{3}. The internal angle at each vertex of a regular dodecagon is 150°.
Excerpted from Wikipedia’s “dodecagon” article, available under the CC BY-SA 4.0 licence.