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An octahedron.

A heptagonal pyramid or a hexagonal prism or two quadrilateral pyramids attached at their bases. There are probably other configurations as well.

Q: What solid has eight faces?

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If you ask this, you fail Octahedron

Octohedron, or diamond

six faces

A solid with four faces for maths is a tetrahedron.

In geometry, an octahedron (plural: octahedra) is a polyhedron with eight faces. A regular octahedron is a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex.It is a 3-dimensional cross polytope (shape).---Wikipedia

Related questions

A cube is a solid figure with eight vertices and all faces of equal size.

Octahedron

A pyramid

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

It is a regular octahedron.

If you ask this, you fail Octahedron

An octahedron is any solid shape with eight flat faces.

Octohedron, or diamond

An octahedron is a closed solid shape with eight polygonal faces.

Greek "octa-" = eight, "hedra" = seat or base.So it is a [solid] shape with eight bases or faces.

A quadrilateral based pyramid.

A Platonic solid is a solid all of whose face are regular and congruent polygons.There are five of these:A Tetrahedron. Four faces, each an equilateral triangle.Ad InfoA Hexahedron (Cube). Six faces, each a square.An Octahedron. Eight faces, each an equilateral triangle.A Dodecahedron. Twelve faces, each a regular pentagon.An Icosahedron. Twenty faces, each an equilateral triangle.