A = (0.023368960064275843, 4.114332571436387)
B = (-2.484356507888073, 0.8558867404664566)
C = (3.856834643558312, 2.5330279769950974)
đa giác1, c, a, b = Polygon(A, B, C)
d = Circle(B, A, C)
α = Angle(B, A, C)
O = Center(d)
e = Line(B, O)
D = Intersect(d, e, 2.0)
f = Segment(B, D)
g = Segment(D, C)
β = Angle(B, D, C)
γ = Angle(C, D, B)
δ = Angle(B, C, D)