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A solid with 8 faces is an octahedron.

As all faces are the same it is a regular octahedron.

As such it is one of the five platonic solids - the only five 3D objects that can be regular: the tetrahedron (4 equilateral triangles for the faces), the hexahedron (usually called a cube with 6 square faces), the octahedron (as asked, 8 equilateral triangles for the faces), dodecahedron (12 regular pentagons as faces), icosahedron (20 equilateral triangles as faces).

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A regular octahedron.

octahedron

Q: What has 8 congruent equilateral triangles as faces and 6 vertices?

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An icosahedron.

An octahedron.

The Platonic solid known as an octahedron would fit the given description

It is a regular triangle pyramids

You are a triangular based pyramid (tetahedron) with 4 faces, 6 edges and 4 vertices.

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octahedron

Icosahedron

An Icosahedron.

An equilateral triangular pyramid

Equilateral triangles

An octahedron.

An icosahedron.

An octahedron.

Octahedron- A polyhedron with eight faces. All faces of a regular octahedron are congruent, equilateral triangles.

The Platonic solid known as an octahedron would fit the given description

The minimum numbers of congruent faces are as follows: On an equilateral triangular prism: one pair of triangles On a right equilateral triangular prism: one pair of triangles and one triplet of rectangles.

1~Tetrahedron *4 faces (made of equilateral triangles) *6 edges *5 vertices 2~Hexahedron (cube) *6 faces (made of squares) *12 edges *8 vertices 3~Octrahedron *8 faces (made up of equilateral triangles) *12 edges *6 vertices 4~Icosahedron *20 faces (made of equilateral triangles) *30 edges *12 verticies 5~Dodecahedron *12 faces (made of pentagons) *30 edges *20 vertices.