D = (-4.197143630923966, -0.17564225767640043)
C = (4.304411644079188, -0.06892817472657005)
đa giác1, a, b, c, d, B, A = Polygon(D, C, 4.0)
e = Segment(A, C)
f = Segment(B, D)
O = Intersect(e, f)