Varignon Parallelogramm per Kantenmittelpunkte eines Vierecks

A = (-0.544685557361676, 2.738751551762714)
B = (3.4553144426383224, 2.738751551762714)
C = (3.4553144426383224, 4.738751551762711)
D = (-0.544685557361676, 4.738751551762711)
Vieleck1, a, b, c, DA = Polygon(A, B, C, D)
I = Midpoint(D, A)
J = Midpoint(A, B)
K = Midpoint(B, C)
L = Midpoint(C, D)
Vieleck2, i_1, j, k, l = Polygon(I, J, K, L)
α = Angle(l, j)
β = Angle(l, j)