They can.
vector, vertex, vertical
No.
A cone has only one vertex (the apex).
minimum point
Yes, since the vertex is a point and the vertical angles share that point.
They can.
That is the correct spelling of "vertices", the plural of the term vertex.
have the same vertex. be congruent.
The Latin root word for a vertical support is "columna."
It is called a vertex.
vector, vertex, vertical
No.
not all congruent angles are vertical angles. Vertical angles must share a vertex.
A trapezium.
A cone has only one vertex (the apex).
Well it could be complementary or supplementary because they don't have to share a vertex yet I think you mean something like the vertical angle. You can go research vertical angles. I'll give you a link for the vertical angles. http://www.mathsisfun.com/geometry/vertical-angles.html