F = (4, -2)
A = (1, -2)
s = Ray(A, F)
B = (4, 1)
h = Segment(A, F)
C = Point(s)
i = Segment(F, C)
p = Segment(B, F)
q = Segment(A, F)
r = Segment(F, C)
δ = Angle(A, F, B)
ε = Angle(B, F, C)
hoekbl = 0.8901179185171081 rad (slider from 0 to 90°, step °)
hoekro = 0.6457718232379019 rad (slider from 0 to 90°, step °)
C' = Rotate(C, hoekbl, F)
ζ = Angle(C, F, C')
g = Segment(F, C')
γ = Angle(C', F, A)
C'_1 = Rotate(C, (-hoekro), F)
α = Angle(C'_1, F, C)
f = Segment(F, C'_1)