(graphic)
(terpri)
(princ "Demonstration des")(terpri)(princ "polygon-Befehls")(terpri)
(count 200
  (polygon (random 4)
    (- 210 (random 420))(- 190 (random 380))
    (- 210 (random 420))(- 190 (random 380))
    (- 210 (random 420))(- 190 (random 380))))