Déplacer  les sommets du carré.
 et observer les propriétés du carré.
(celles qui ne changent pas)

M = (-0.72, 0.16)
L = (3.94, 0.52)
a = Segment(M, L)
b = OrthogonalLine(M, a)
c = OrthogonalLine(L, a)
d = OrthogonalLine(M, a)
e = OrthogonalLine(L, a)
f = Circle(L, M)
K, D = Intersect(f, e)
g = Circle(M, L)
J = Intersect(g, d, 1.0)
h = Segment(J, K)
i = Segment(L, K)
j = Segment(M, J)
α = Angle(J, M, L)
β = Angle(M, L, K)
γ = Angle(L, K, J)
δ = Angle(K, J, M)