There are one square, one decagon, and one dodecagon on each vertex. A twelve-sided polygon is a dodecagon. A truncated hexagon is a dodecagon, t{6}={12}. In geometry, a dodecagon or 12-gon is any twelve-sided polygon. There are one square, one hexagon, and one dodecagon on each vertex. There are one square, one octagon, and one dodecagon on each vertex. A truncated hexagon, t{6}, is a dodecagon, {12}, alternating 2 types (colors) of edges. A "skew zig-zag dodecagon" has vertices alternating between two parallel planes. A regular skew dodecagon is vertex-transitive with equal edge lengths. The interior of such an dodecagon is not generally defined. The "regular dodecagon" has Dih symmetry, order 24. The Playing Field was a carpeted regular dodecagon which measured across. The building is a three-story dodecagon, 42 feet in diameter. A dodecagonal number is a figurate number that represents a dodecagon. A six-sided (half a dodecagon) projection on the west side houses the Sunday-school room.