A tetrahedron need not have any verticals.
A square pyramid has five vertices whereas a triangular pyramid (tetrahedron) has four.
A tetrahedron does not normally have any verticals but it can have three [mutually] vertical edges at one vertex, or two sets of mutually perpendicular edges at two vertices.
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
It does not!
4
Eight.
A tetrahedron has 4 faces.
A tetrahedron has four faces.
A tetrahedron has 4 faces.
A tetrahedron has 4 vertices.