D = (2.79921603635562, -2.5462722590482585)
C = (9.681240263510158, -1.3912472139314145)
f = Segment(D, C)
C_1 = (5.013014039496242, -2.0890748453561754)
g = OrthogonalLine(D, f)
h = OrthogonalLine(C, f)
A = Point(g)
i = OrthogonalLine(A, g)
B = Intersect(i, h)
q1, d, e, b, a = Polygon(A, B, C, D)
j = Segment(D, B)
k = Segment(A, C)
I = Intersect(k, j)
l = OrthogonalLine(B, j)
E = Point(l)
F = Point(l)
α = Angle(D, B, F)
β = Angle(B, C, A)
γ = Angle(E, B, A)