A = (-8, -15)
straal = 3 (slider from 0 to 5, step 0.1)
c = Circle(A, straal)
B = Point(c)
D = Point(c)
e = CircleArc(A, B, D)
d = CircleArc(A, D, B)
E = Point(e)
f = Segment(E, D)
C = Point(d)
g = Segment(D, C)
h = Segment(C, B)
i = Segment(B, E)
j = Segment(C, E)
k = Segment(D, B)
α = Angle(D, B, C)
β = Angle(C, D, B)
γ = Angle(B, D, E)
δ = Angle(E, C, B)
ε = Angle(D, C, E)
ζ = Angle(E, B, D)
η = Angle(D, E, C)
θ = Angle(C, E, B)