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Q: What is the name of a 3d shape with 8 faces?

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A OctahedronThis shape has 8 faces.

Octahedron

8

It is an octahedron that is a 3D shape with 8 faces

A 3-D shape that has 8 faces is a hexagonal prism. This is a shape that is formed on a hexagon-shaped base.

According to Euler none; for all 3d shapes: Vertices + Faces = Edges + 2 ⇒ 12 + 8 = 19 + 2 ⇒ 20 = 21 So unless 20 does equal 21, no 3d shape has 8 faces, 19 edges and 12 vertices. Any 3d shape with 8 faces would be an octahedron.

The question is ambiguous. An octagon is a 2-dimensional shape with 8 edges and 8 vertices. Does a 3-D octagonal shape mean one with 8 edges or 8 faces or vertices, or faces which are 2d octagons?

A hexagonal prism.

Nonahedron.

Hexagonal prism.

A hexagonal prism

The three-dimensional platonic solid with eight faces is an octahedron.

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