A duodecagon has twelve sides and twelve corners. A duodecagon is usually called a dodecagon.
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triangle square pentagon hexagon heptagon octagon nonagon decagon undecagon duodecagon ... 99-gon 100-gon 101-gon ...
3 triangle, trigon 12 dodecagon, duodecagon 13 triskaidecagon, tridecagon 14 tetrakaidecagon, tetradecagon 15 pentadecagon
Geometric shapes formed from three or more straight lines (polygons) include:3 sidestriangle4 sides (quadrilaterals)square (4 equal sides, right angles)trapezoid (4 sides with only 1 set of parallel lines)rectangle (4 sides with 2 sets of parallel lines)rhombus (4 sides, 2 parallel pair)5 sides - pentagon6 sides - hexagon7 sides - heptagon (rarely septagon)8 sides - octagon9 sides - enneagon (classically - nonagon)10 sides - decagon11 sides - hendecagon (classically - undecagon)12 sides - dodecagon (classically - duodecagon)13 sides - tridecagon or triskaidecagon14 sides - tetradecagon15 sides - pentadecagon16 sides - hexadecagon17 sides - heptadecagon18 sides - octadecagon19 sides - enneadecagon (nonadecagon)20 sides - icosagon*For a list of some other basic shapes, see the related link.
duodecagon duodecagon
A duodecagon has twelve sides and twelve corners. A duodecagon is usually called a dodecagon.
Providing that it is a regular duodecagon each exterior angle measures 30 degrees
Not sure about a duodecagon, but a regular dodecagon has 12 axes of symmetry.
duodecagon
Duodecagon <--wrong... a duodecagon is a 12-sided polygon. icosagon is a 20 sided polygon.
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It's called a dodecagon or a duodecagon.
Check http://en.wikipedia.org/wiki/Dodecagon for a 23 step animation using a compass and a straight edge.