A = (-0.5396791021092062, -0.767112471070102)
B_1 = (6.12, 3.04)
a = Line(A, B_1)
C = (0.66, 3.24)
D = (6.36, 0.72)
b = Line(C, D)
O = Intersect(a, b)
c = Circle(O, A)
B, B' = Intersect(c, b)
G, A' = Intersect(c, a)
poly1, a_1, b_1, a', b' = Polygon(A, B, A', B')
α = Angle(A, O, B')