Càlcul de l'angle de tir per endevinar 
la bolla vermella.

A = (-0.44, 4.66)
B = (12.9, 4.64)
a = Line(A, B)
C = Point(a)
D = (8.4, 11.56)
E = (2.48, 8.66)
F = (7.14, 6.24)
b = Segment(F, C)
c = Segment(C, E)
d = OrthogonalLine(C, a)
G = Point(d)
α = Angle(F, C, G)
β = Angle(G, C, E)