O = (4.12, 1.42)
P = (6.54, -0.08)
c = Circle(O, P)
M = (-0.28, 0.92)
A = Point(c)
a = Line(M, A)
B = Intersect(c, a, 2.0)
texte1: "MA x MB =" + (Distance[M, A] * Distance[M, B])