E_1 = (-6.057978163022511, -11.480476279221453)
A = (10.14310731850168, -3.562378194782829)
C = (17.36791570891112, -3.4894003322534406)
a = Segment(A, C)
b = OrthogonalLine(A, a)
c = Circle(A, C)
B = Intersect(c, b, 2.0)
d = Segment(B, A)
e = Segment(B, C)
α = Angle(C, A, B)