AB=

AC=

BC=

AB/BC=

AC/BC=

AC/AB=

A = (-1.28, 4.68)
B = (-2.26, -1.86)
a = Segment(A, B)
α = 0.6981317007977318 rad (slider from 0 to 90*°, step 0.017453292519943295)
A' = Rotate(A, (-α), B)
β = Angle(A', B, A)
b = OrthogonalLine(A, a)
c = Ray(B, A')
C = Intersect(b, c)
d = Segment(A, C)
e = Segment(B, C)
γ = Angle(B, A, C)