A = (3.06, 4)
C = (5.54, 0.52)
a = Line(A, C)
B = (1.98, 1.24)
b = Line(A, B)
c = Line(B, C)
D = Point(b)
d = Line(D, c)
E = Intersect(a, d)
poly1, d_1, a_1, c_1 = Polygon(A, C, D)
e = OrthogonalLine(C, b)
M = Intersect(b, e)
f = Segment(M, C)
α = Angle(f, c_1)