O = (4.264627875507442, -0.6255751014884969)
B_1 = (7.981353179972936, -3.372719891745601)
c = Circle(O, B_1)
A = Point(c)
a = Ray(A, O)
B = Intersect(c, a, 2.0)
b = Segment(A, B)
d = Semicircle(B, A)
C_1 = Intersect(c, d, 1.0)
D = Intersect(c, d, 1.0)
E = Intersect(c, d, 1.0)
C = Point(d)
e = OrthogonalLine(C, b)
G = Intersect(e, b)
C' = Intersect(c, e, 2.0)
α = Angle(C', G, E)
f = Segment(C, G)
g = Segment(G, C')