A1 = (3.98, -2.66)
B1 = (10.819148936170214, 1.6106382978723404)
a = Line(A1, B1)
A = (3.380851063829788, 3.7127659574468086)
B = (4.993191489361703, 4.002127659574468)
C = (8.31276595744681, 3.2882978723404257)
D = (4.69468085106383, -1.1787234042553192)
poly1, c, d, e, f = Polygon(A, B, C, D)
C' = Mirror(A, a)
D' = Mirror(B, a)
E' = Mirror(C, a)
F' = Mirror(D, a)
poly1', c', d', e', f' = Polygon(C', D', E', F')