Prototroctes vertex was created in 2012.
Prototroctes modestus was created in 2012.
Vertex Pharmaceuticals was created in 1989.
Vertex - company - was created in 1996.
Vertex - album - was created in 1996.
The vertex angle is connected to the vertex point
A cube has no vertex
A circle does not have a vertex.
Vertex of a triangle is any of its 3 corners and the plural of vertex is vertices
vertex
A triangle is not a segment joining a vertex and the midpoint of the side opposite the vertex.
They're angles. End of story.
A vertex !