A twelve sided shape is a dodecagon.
a twelve sided shape is called a dodecagon.
Dodecagon
A twelve-sided plane figure is called a dodecagon.
A 12 sided shape is called a dodecagon.
dodecagon
12-gon
A twelve sided shape is called a "dodecahedron" :D
Dodecagon
A dodecagon is a polygon that has twelve sides. A regular dodecagon has twelve internal angles of 150 degrees each.
Dodecagon is the name for the regular 12 sided polygon, meaning that all its side lengths and angles are the same. Not sure if there is a name for a general 12 sided 2d shape.
Dodeca-, meaning 2+10, is used in describing any 12-sided figure thus dodecagon