A = (-1.4968617549357444, -5.423313689282228)
C = (4.304878316150617, -5.496291551811616)
a = Segment(A, C)
b = OrthogonalLine(A, a)
B = Point(b)
đa giác1, b_1, c, a_1 = Polygon(B, A, C)
D = (7.479415336179011, -5.386824758017533)
d = Circle(D, c)
e = Circle(D, b_1)
F = Point(d)
f = Segment(D, F)
g = OrthogonalLine(D, f)
E = Intersect(e, g, 2.0)
đa giác2, e_1, f_1, d_1 = Polygon(E, D, F)
α = Angle(A, B, C)
β = Angle(D, E, F)
γ = Angle(C, A, B)
δ = Angle(F, D, E)