A tetrahedron.
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Tetrahedron
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.
NO!!! It is a seven(7) - sided 2-dimensional polygon. A Heptahedron is a seven(7) -sided 3-dimensional object.