An 11-sided 3D shape is a hendecahedron.
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a henagon is an 11 sided 2-D shape and a 3-D is called an hendecahedron.
A 12 sided 3D shape is called a dodecahedron.
HEXADECAHEDRON is the correct name for a 16 sided 3D object
tricotakaidihedron*
Triskaidecahedron