# Add vertex

### Vertex

A graph consists of vertices and edges. Edges connect vertices. Usually vertices have their own label or name. Occasionally vertices may be distinguished by colour, for instance while painting the graph.

### How to add vertices

In order to add vertices you have to select "Add vertex" in the menu bar and click on the work area where you want to place a vertex.

If you add new vertices in the adjacency matrix or incidence matrix, then they will appear in the working area.

### Vertices enumeration

In the help window you may choose how to index the vertices. There are 4 types:

- 1, 2, 3... - numbers.
- A, B, C... - in Latin letters.
- А, Б, В... - in Cyrillic letters.
- Α, Β, Γ, Δ... - in Greek letters.