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A_0 = (-4, -4)
A_1 = (-5, -1)
A_2 = (-2, 3)
A_3 = (2, 4)
A_4 = (5, 3)
A_5 = (6, 1)
A_6 = (4, -1)
A_7 = (2, -2)
O = (0, 0)
r_7 = Vector(O, A_7)
r_6 = Vector(O, A_6)
r_5 = Vector(O, A_5)
r_4 = Vector(O, A_4)
r_3 = Vector(O, A_3)
r_2 = Vector(O, A_2)
r_1 = Vector(O, A_1)
r_0 = Vector(O, A_0)
A_8 = Point(yAxis)
r_8 = Vector(O, A_8)
a = false
Δr = Vector(A_0, A_8)
A = (-4, -4)