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Das Einbandenproblem:
Testen....

Du kannst die Punkte P und Q 
entlang der grünen Bande verschieben ...

A = (-9, 6)
B = (9, 6)
a = Segment(A, B)
C = (9, -6)
b = Segment(B, C)
D = (-9, -6)
c = Segment(C, D)
d = Segment(D, A)
E = (-5.92, -1)
Vieleck1, a_1, b_1, c_1, d_1 = Polygon(A, B, C, D)
F = (4, -1)
G = (2.94, 2.72)
e = Line(E, F)
P = Point(a)
u = Vector(E, P)
v = Vector(P, F)
α = Angle(A, P, E)
β = Angle(F, P, B)
Q = Point(a)
w = Vector(E, Q)
f = Vector(Q, G)
γ = Angle(A, Q, E)
δ = Angle(G, Q, B)