$A$

$B$

$D$

$C$

$\alpha$

$\beta$

$\beta$

$\alpha$

A = Point(xAxis)
B = Point(xAxis)
C = (-2, 4)
D = (4, 4)
f = Segment(A, C)
g = Segment(C, D)
h = Segment(D, B)
i = Segment(B, A)
j = Segment(A, D)
α = Angle(C, D, A)
β = Angle(A, D, B)
γ = Angle(C, A, D)
δ = Angle(D, A, B)