A = (0.18, 2.08)
B = (-3.02, -3.06)
C = (4.9, -3.04)
D = (3.54, 2.08)
poly1, a, b, c, d = Polygon(A, B, C, D)
E = Midpoint(c)
α = 0 rad (slider from 0 to 3.141592653589793, step 0.017453292519943295)
A' = Rotate(A, -α, E)
B' = Rotate(B, -α, E)
C' = Rotate(C, -α, E)
D' = Rotate(D, -α, E)
poly1', a', b', c', d' = Polygon(A', B', C', D')