 2) Déplacer le point M sur le cercle. 

1) Mesurer l'angle α = (AMB)

3) Observer la mesure de l'angle α

i = (1, 0)
j = (0, 1)
E = (3, 2)
B_1 = Point(xAxis)
c = Circle(E, B_1)
A = Point(c)
B = Point(c)
a = Segment(A, B)
M = Point(c)
b = Segment(A, M)
d = Segment(M, B)
α = Angle(A, M, B)