M = (-5, -1)
vgl1: x = x(M)
A_1 = Point(vgl1)
i: y = y(A_1)
f: y = y(M)
B = Point(f)
A = Point(i)
g = Segment(B, A)
D: (x(A) + 100, y(A))
G: (x(A_1) + 100, y(A_1))
k = Ray(A, G)
stap = 6 (slider from 0 to 6, step 1)
β = Angle(A, B, D)
L = (-5.913066838027928, -3.557979238367027)
j = Ray(A, A_1)
α = Angle(A_1, A, B)