(d)

a = 32 (slider from 0 to 100, step 1)
B = (-4, -6)
A = (2, 2)
C = (5.783579140566203, 2.6842826372754844)
D = (4.810894772470012, -2.9841193699058124)
f = Segment(C, D)
image2 = Mirror(image1_4, f)
A' = Mirror(A, f)
B' = Mirror(B, f)
g = OrthogonalLine(A, f)
h = OrthogonalLine(B, f)
α = Angle(f, g)
β = Angle(f, h)
E = Intersect(f, g)
i = Segment(A, E)
j = Segment(E, A')
d = Line(C, D)
F = Intersect(h, d)
k = Segment(B, F)
l = Segment(F, B')