α_s

A = (-2.5, 6.5)
B = (-3.5, 3)
a_s = Line(A, B)
P = (-13.955494106868194, 9.49284986805154)
g = OrthogonalLine(P, a_s)
F_P = Intersect(a_s, g)
h = Line(P, a_s)
D' = Rotate(P, 37°, F_P)
α = Angle(P, F_P, D')
i = Line(F_P, D')
P' = Intersect(i, h)
d1, p', p, c = Polygon(P, F_P, P')
C = Point(a_s)
β = Angle(C, F_P, P)
j = Segment(P, P')