A = (3, -6)
C = (14, -6)
f = Segment(A, C)
g = OrthogonalLine(A, f)
h = OrthogonalLine(C, f)
D = Point(g)
B = Point(h)
E_{1} = Midpoint(D, B)
c = Circle(E_{1}, D)
E = Intersect(c, f, 2)
i = Segment(E, D)
j = Segment(E, B)
k = Segment(D, A)
l = Segment(B, C)
α = Angle(B, E, D)
β = Angle(E, A, D)
γ = Angle(B, C, E)