Constructing a Congruent Angle

Same size circle at B and B'

Circle at F' with radius DF

\angle ABC \cong \angle D'B'F'

A = (-0.26, 5.68)
B = (-2.7, 3.84)
a = Segment(A, B)
C = (1.78, 3.36)
b = Segment(B, C)
D_1 = (-3.14, -1.16)
E = (12.56, 1.2)
c = Line(D_1, E)
B' = Point(c)
d = Circle(B, 3 / 5 Distance[A, B])
e = Circle(B', 3 / 5 Distance[A, B])
D = Intersect(d, a, 1)
F = Intersect(d, b, 1)
F' = Intersect(e, c, 2)
f = Circle(F', Distance[D, F])
D' = Intersect(e, f, 1)
g = Ray(B', D')