A = (2, 2)
B = (10, 2)
C = (13, 6)
D = (5, 6)
Vieleck1, a, b, c, d = Polygon(A, B, C, D)
e = Segment(A, C)
f = Segment(B, D)
α = Angle(B, A, D)
β = Angle(C, B, A)
γ = Angle(D, C, B)
δ = Angle(A, D, C)
g = Distance(b, a)
h = Distance(d, c)