Either no verticals or two verticals and two horizontals.
Verticals are corners so in a two dimensional a square has 4 verticals
3 angles 3 verticals
A tetrahedron need not have any verticals.
It does not!
Eight.
4
There need not be any.
4
There are two triangles in three verticals. This is used in math.
5
if you mean vertices. 8