α

β

β

A = (0.74, -0.16)
B = (8.58, 0.98)
f = Ray(A, B)
C = (7.16, 4.64)
g = Ray(A, C)
D = (4.82, -0.3)
h = OrthogonalLine(D, f)
E = Intersect(f, h)
i = Segment(D, E)
E' = Mirror(E, f)
D' = Mirror(D, f)
E'_1 = Mirror(E, f)
i' = Segment(D', E'_1)
j = OrthogonalLine(D', g)
F = Intersect(j, g)
k = Segment(F, D')
F' = Mirror(F, g)
D'' = Mirror(D', g)
k' = Segment(F', D'')
l = Segment(D, A)
m = Segment(D', A)
n = Segment(D'', A)
α = Angle(D, A, E)
β = Angle(E, A, D')
γ = Angle(D', A, F)
δ = Angle(F, A, D'')