>>> from poligon import Poligon
>>> p = Poligon()

>>> from punt2D import Punt2D
>>> 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 p1, p2 in p.iter_arestes():
...     print(p2, p2)
...
Punt2D(5, 3) Punt2D(5, 3)
Punt2D(4, 7) Punt2D(4, 7)
Punt2D(2, 3) Punt2D(2, 3)