Figuur II

straal = 3 (slider from 0 to 5, step 0.1)
E = (1, -19)
d = Circle(E, straal)
F = Point(d)
k = Line(F, E)
G = Intersect(d, k, 2)
c_1 = CircleArc(E, F, G)
d_1 = CircleArc(E, G, F)
l = Segment(F, E)
m = Segment(E, G)
H = Point(c_1)
n = Segment(G, H)
p = Segment(H, E)
I = Point(d_1)
q = Segment(E, I)
s = Segment(I, G)
δ = Angle(I, G, E)
ε = Angle(E, I, G)
ζ = Angle(I, E, F)
η = Angle(F, E, H)
θ = Angle(H, G, E)
ι = Angle(E, H, G)