A, B, C, Schieberegler, Z variieren

D = (4.95, 0.25)
α = 1.3 (slider from -5 to 5)
A = (11.835, -2.045)
B = (26.64, -8.525)
C = (30.87, 6.865)
d1, f_1, c, e = Polygon(A, B, C)
d = Circle(D, 5)
Z = Point(d)
a = Line(D, Z)
Z' = Rotate(Z, α, D)
β = Angle(Z, D, Z')
b = Line(D, Z')
A' = Mirror(A, a)
B' = Mirror(B, a)
C' = Mirror(C, a)
d1', c', a', b' = Polygon(A', B', C')
A'' = Mirror(A', b)
B'' = Mirror(B', b)
C'' = Mirror(C', b)
d1'', c'', a'', b'' = Polygon(A'', B'', C'')