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A decagon based pyramid.

It is a hendecahedron but that can take many shapes. A nonagon based prism, for example.

Q: What is the official name for an 11 sided Pyramid?

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The solid commonly called a dodecahedron is not a solid pyramid but the name simply means a solid shape with 12 faces and so, a pyramid on a 11-sided polygonal base will be a dodecahedron.

The name of a 11 sided polygon is Hendecagon.

The name of a 11 sided polygon is Hendecagon.

Hendecagon

Hendecagon.

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The solid commonly called a dodecahedron is not a solid pyramid but the name simply means a solid shape with 12 faces and so, a pyramid on a 11-sided polygonal base will be a dodecahedron.

The solid commonly called a dodecahedron is not a solid pyramid but the name simply means a solid shape with 12 faces and so, a pyramid on a 11-sided polygonal base will be a dodecahedron.

I think 11 faces

The name of a 11 sided polygon is Hendecagon.

The name of a 11 sided polygon is Hendecagon.

The name of a 11 sided polygon is Hendecagon.

The name of a 11 sided polygon is Hendecagon.

The name of am 11-sided figure is a "hendecagon". ---- Also known as an "undecagon".

The name of a 11 sided polygon is Hendecagon.

undecagon is the most common name for an 11 sided polygon.

a hendecagon has 11 sides =)

The name of a 11 sided polygon is Hendecagon.