octahedron
What polyhedron has eight sides and all of the are equilateral triangle?
Octahedron- A polyhedron with eight faces. All faces of a regular octahedron are congruent, equilateral triangles.
tetrahedron
An octahedron.
an octahedron
You're an octagon.
A regular octahedron.
Octohedron, or rhomboid.
A regular octahedron.
A regular octahedron.
Tetrahedron, icosahedron.