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).
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.
octahedron
Icosahedron
An Icosahedron.
An equilateral triangular pyramid
Equilateral triangles
An icosahedron.
An octahedron.
An octahedron.
The Platonic solid known as an octahedron would fit the given description
Octahedron- A polyhedron with eight faces. All faces of a regular octahedron are congruent, equilateral triangles.
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.