None.
Vertices is a plural term and therefore "a vertices" cannot exist. As a result "a vertices" cannot have any vertices. In fact, it cannot have anything apart from non-existence.
it has 30 vertices
11 vertices
It has 12 vertices
A dodecagon has twelve vertices.
Did you mean vertices? A rectangular prism would have 8 vertices.
16 vertices.16 vertices.16 vertices.16 vertices.
A pentacontagon has 50 vertices (not vertices's!).
8 vertices
Eight vertices
it has 30 vertices
11 vertices
There are 10 vertices.
5 vertices
8 vertices
It has 8 vertices
40 vertices
8 vertices.