A = (0.2, 0.7)
B = (4.08, 0.1)
a = Segment(A, B)
b = OrthogonalLine(B, a)
c = OrthogonalLine(A, a)
d = Circle(B, A)
C = Intersect(d, b, 2)
e = OrthogonalLine(C, b)
D = Intersect(c, e)
f = Segment(B, C)
g = Segment(C, D)
h = Segment(D, A)
α = Angle(B, A, D)
β = Angle(C, B, A)
γ = Angle(D, C, B)