The vertices of a polygon in the plane: vertices vertices_abc

### 13.6.13 The vertices of a polygon in the plane: vertices vertices_abc

The vertices command finds the vertices of a polygon.
vertices_abc is a synonym for vertices.

- vertices takes one argument:
  P, a polygon.
- vertices(P) returns a list of the vertices of P and draws them.

#### Examples

- Input:
  vertices(equilateral_triangle(0,2))
  Output:
- Input:
  C:= vertices(equilateral_triangle(0,2))[2]
  Output: