     BC = DC
Góc A ? Góc B

B = (-0.09272727272727313, 1.8363636363636362)
A = (-2.601818181818182, -1.909090909090909)
C = (4.18, -2)
đa giác1, c, a, b = Polygon(B, A, C)
d = Circle(C, B)
f = Line(A, C)
e = Circle(C, B)
D, E = Intersect(e, f)
h = Segment(D, A)
i = Segment(A, C)
g = Segment(D, C)
α = Angle(C, A, B)
β = Angle(A, B, C)