A_1 = (-2.9621723995985225, 0.9667402484944679)
B_1 = (12.960558604153816, 0.8663447188365087)
a = Line(A_1, B_1)
C_1 = (-2.9220141877353387, -2.988843620029127)
b = Line(C_1, a)
D_1 = (1.5757055409412364, 4.520741998386225)
c = OrthogonalLine(D_1, a)
E = (3.824565405279524, -5.277861696230598)
F = (11.7558122482583, 4.058922561959613)
d = Line(E, F)
A = Intersect(a, c)
B = Intersect(b, c)
C = Intersect(b, d)
D = Intersect(a, d)
α = Angle(D, C, B)
D_2 = Angle(B_1, A, D_1)