In geometry, a tridecagon (or triskaidecagon) is a 13-sided (and angled) polygon.
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The name of a tweleve sided shape is a dodecagon.
a twelve sided shape is called a dodecagon.
A Tetracontakaitetragon is a forty - five sided shape ...
Triskaidecahedron
The name of an eleven sided geometric shape is a Hendecagon or endecagon.