F = (2.82876325229194, 3.2989799897916474)
G = (3.941496201693358, -0.605701087198783)
a = Segment(F, G)
H_1 = Rotate(F, 255.0*°, G)
α = Angle(H_1, G, F)
b = Line(G, H_1)
c = Line(G, b)
H = Point(b)
d = Line(H, a)
E = Point(d)
đa giác1, f, g, a_1, b_1 = Polygon(F, G, H, E)
β = Angle(E, H, G)