A = (-0.13392407860694142, 4.081926276012895)
B = (9.178658226814925, 10.107714826579985)
a = Segment(A, B)
c = Semicircle(B, A)
C_1 = Point(c)
D = Mirror(B, C_1)
C = Mirror(A, C_1)
đa giác1, a_1, b, a', b' = Polygon(A, B, C, D)