A = (16.545637664621953, 3.2799950996514915)
B = (10.57711442810645, -3.453091030797819)
C = (22.316854347864222, -3.453091030797819)
a = Line(A, B)
d = Line(B, C)
c = Line(C, A)
d_1 = Segment(A, B)
e = OrthogonalLine(A, d)
H = Intersect(d, e)
f = Segment(A, H)
D = (11.218360726244478, -5.722116393440078)
E = (13.734019280478286, -5.697453074280923)
b = Segment(D, E)
g = Circle(H, b)
F = Intersect(g, d, 2.0)
α = Angle(F, H, A)