 \vec{ AB } 

Déplacer le point M avec la souris

- \frac{ 2π }{ 3}   correspond  à  -120°

A = Intersect(xAxis, yAxis)
B = Point(xAxis)
C = Rotate(B, 1.0471975511965976, A)
a = Segment(A, B)
b = Segment(B, C)
c = Segment(C, A)
I = Midpoint(B, C)
M = (5.286928108894782, 4.955548798690455)
v = Vector(I, M)
u = Vector(A, B)
I' = Translate(I, u)
w = Vector(I, I')
α = Angle(M, I, I')
Aide = false
M': M