A = (-7, 2)
B = (-2, 2)
D = (0, 5)
C = (-5, 5)
f = Segment(A, B)
g = Segment(B, D)
h = Segment(D, C)
i = Segment(C, A)
j = Segment(A, D)
α = Angle(B, A, D)
β = Angle(C, D, A)
γ = Angle(A, D, B)
δ = Angle(D, A, C)