Q: Polyhedron with equilateral triangles and 8 faces?

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Octohedron, or rhomboid.

A regular octahedron.

A regular octahedron or a square based dipyramid.

The answer is a polyhedron

A heptagonal pyramid and a square based dipyramid are two possibilities. There are others.

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octahedron

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Octohedron, or rhomboid.

A regular octahedron.

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A regular octahedron or a square based dipyramid.

The answer is a polyhedron

A heptagonal pyramid and a square based dipyramid are two possibilities. There are others.

Octahedron.

Equilateral triangles

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).