This is an Octahedron!
Octohedron, or rhomboid.
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).
The answer to your question, is an Octahedron.
An octagonal pyramid
Octagonal Pyramid
An octahedron
14 faces (: 8 triangles and 6 squares
This is an Octahedron!
an octagon
Octohedron, or rhomboid.
A cuboctahedron has 14 faces: 8 triangles and 6 squares.
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).
Equilateral triangles
octagonal pyramid :)
The answer to your question, is an Octahedron.
An octagonal pyramid