An 18 sided shape is called a octadecagon. This refers to both 2 dimensional and 3 dimensional shapes in a mathematical sense.
no
Octadecadron
A 12 sided 3D shape is a dodecahedron.
A tridekahedron is a 3D 30 sided shape.
An 11-sided 3D shape is a hendecahedron.
A 12 sided 3D shape is called a dodecahedron.
A hexahedron is the name for a 6 sided 3D shape.
the name of a 20 sided 3d shape is called a icosahedron
a 4 sided 3d shape is called a triangular prism!!!!!!!!!!!!!!!
There is not a definite name for a 3D figure with 18 sides.It is possible that it is something else - but the information to test this is not provided.
NO!!! It is a seven(7) - sided 2-dimensional polygon. A Heptahedron is a seven(7) -sided 3-dimensional object.
HEXADECAHEDRON is the correct name for a 16 sided 3D object