A = (-1.7812726361621387, 2.4714463642319866)
B = Point(Circle[A, 6.0])
a = Segment(A, B)
B' = Rotate(B, 297.0*°, A)
α = Angle(B', A, B)
b = Line(B', A)
c = OrthogonalLine(A, b)
d = LineBisector(A, B)
M = Intersect(c, d)
e = Circle(M, A)
C = Point(e)
β = Angle(A, C, B)
Vieleck1, c_1, a_1, b_1 = Polygon(A, B, C)