Q: What 3d shape has an 8 sided base and 9 faces?

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A dodecahedron (literally, "12 face solid").The "regular dodecahedron" has 12 identical faces, all regular pentagons ("5 sided flat shape").But there are many, many other 3d shapes with 12 faces, including the rhombic dodecahedron which has 12 identical faces, all 4 sided parallelograms.what shape has 12 faces?

The simplest such shape is PYRAMID.

A square base pyramid

A five sided 3d shape is called a pentehedron

a 4 sided 3d shape is called a triangular prism!!!!!!!!!!!!!!!

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they are: ---sided pyramids and triangular prisms and 20 sided 3d shapes

A pyramid with an n-sided base will have n + 1 vertices, n + 1 faces, and 2n edges.

A 3D 5 sided shape is called a dodecahedron. It is a solid with 20 vertices, 30 edges and 12 equal pentagonal triangular faces.

A 12 sided 3D shape is a dodecahedron.

A tridekahedron is a 3D 30 sided shape.

A dodecahedron (literally, "12 face solid").The "regular dodecahedron" has 12 identical faces, all regular pentagons ("5 sided flat shape").But there are many, many other 3d shapes with 12 faces, including the rhombic dodecahedron which has 12 identical faces, all 4 sided parallelograms.what shape has 12 faces?

A dodecahedron is a 3-d shape with 12 faces that are regular pentagons.

A 14-sided and 3-dimensional shape is called either a tetrakaidecahedron or tetradecahedron. This 14-sided polyhedron can have six quadrilateral and eight hexagonal faces.

tetrahedra (a pyramid with a triangular base)

The simplest such shape is PYRAMID.

A 3D shape with one base and three faces can only have triangular faces.

An 11-sided 3D shape is a hendecahedron.