P_1 = (-3, -1)
P_{3} = (-1, -2)
P_4 = (2, -1)
P_5 = (3, 0)
P_2 = (-2, -2)
P_6 = (4, 3)
P_{7} = (1, 3)
P_{8} = (-2, 2)
P_{9}: (-3, 1)
Vieleck1, p_1, p_2, p_{3}, p_4, p_5, p_6, p_{7}, p_{8}, p_{9} = Polygon(P_1, P_2, P_{3}, P_4, P_5, P_6, P_{7}, P_{8}, P_{9})
P1 = NaN
P2 = NaN
P3 = NaN
P4 = NaN
P5 = NaN