## Dodecagon

The constructible regular 12-sided Polygon with Schläfli Symbol . The Inradius , Circumradius , and Area can be computed directly from the formulas for a general regular Polygon with side length and sides,

 (1) (2) (3)

A Plane Perpendicular to a axis of a Dodecahedron or Icosahedron cuts the solid in a regular Decagonal Cross-Section (Holden 1991, pp. 24-25).

The Greek, Latin, and Maltese Crosses are all irregular dodecagons.

See also Decagon, Dodecagram, Dodecahedron, Greek Cross, Latin Cross, Maltese Cross, Trigonometry Values Pi/12, Undecagon

References

Holden, A. Shapes, Space, and Symmetry. New York: Dover, 1991.