B_1 = (6.88, -0.32)
C_1 = (5.22, -0.44)
B_2 = (-20.200435411268916, -3.253986013123313)
B_3 = (-21.944587835014307, -13.114193220754837)
O = (-40.357605722759956, -0.5426274408129923)
B_4 = (-25.407688763672528, -13.310664627493072)
c = Circle(O, B_4)
A = Point(c)
đa giác1, a, b, d, B = Polygon(O, A, 3.0)
e = CircleSector(O, A, B)
α = Angle(A, O, B)
f = Segment(B, A)