A = (47.21057054579438, 17.39547772400155)
B = (35.819005013298174, 2.628633515210168)
C = (64.50887376180717, 2.6989518209663177)
đa giác1, c, a_1, b = Polygon(A, B, C)
D = (29.06844766070783, 10.012055619605864)
a = Line(D, a_1)
d = Line(B, A)
e = Line(A, C)
B' = Intersect(a, d)
C' = Intersect(a, e)