A = (-0.9697731536755904, -1.8919154016715003)
B = (-0.37596452328159435, 1.2354767184035458)
a = Ray(A, B)
C_1 = Point(a)
C' = Rotate(C_1, 310.0*°, B)
α = Angle(C', B, C_1)
b = Ray(B, C')
B' = Rotate(B, 290.0*°, A)
X = Angle(B', A, B)
c = Ray(A, B')
D = Point(c)
d = Line(D, a)
C = Intersect(d, b)
đa giác1, b_1, a_1, d_1, e = Polygon(B, A, D, C)
Y = Angle(B, C, D)
f = Circle(D, A)
F = Intersect(f, c, 2.0)
β = Angle(F, D, C)