A_1 = (-10.607345454545442, 4.211001818181818)
B_1 = (20.644534545454576, 6.287361818181817)
a_1 = Line(A_1, B_1)
A = (4.193374545454557, -1.2993381818181824)
b = Line(A, a_1)
C = Point(b)
c = OrthogonalLine(A, b)
B = Intersect(a_1, c)
d = Segment(B, A)
e = Segment(B, C)
α_1 = Angle(C, A, B)
α = Angle(B, C, A)
a = Segment(A, C)