>>> from poligon import Poligon
>>> from punt2D import Punt2D

>>> p = Poligon()

>>> p1 = Punt2D(2, 3)
>>> p.afegir_vertex(p1)

>>> p2 = Punt2D(5, 3)
>>> p.afegir_vertex(p2)

>>> p3 = Punt2D(4, 7)
>>> p.afegir_vertex(p3)

>>> for vert in p:
...    print(vert)
Punt2D(2, 3)
Punt2D(5, 3)
Punt2D(4, 7)