b)

E = (3.8571826237167164, 4.786239223481776)
G = (14.617519321157946, 4.786239223481776)
i = Segment(E, G)
j = LineBisector(i)
F = Point(j)
H = Mirror(F, i)
I = Intersect(j, i)
đa giác2, f_1, h_1, g_1, h' = Polygon(E, F, G, H)
k = Segment(F, I)
l = Segment(I, G)
m = Segment(I, E)
n = Segment(I, H)
α = Angle(E, F, I)
β = Angle(I, F, G)