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A polyhedron with equilateral triangular faces is called a deltahedron. There are infinitely many of them but only 8 convex ones. The following three are regular:
tetrahedron, octahedron and icosahedron.
There are 5 more convex polyhedra which are convex but not regular (because they have differing number of faces meeting at their vertices) These are Johnson deltahedra (see link).
octahedron
tetrahedron
Octohedron, or rhomboid.
A regular octahedron.
Not necessarily. If all faces are equilateral triangles (all edges are equal length) then it is a regular polyhedron.
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.
octahedron
tetrahedron
An octahedron.
an octahedron
You're an octagon.
A regular octahedron.
Octohedron, or rhomboid.
A regular octahedron.
A regular octahedron.