straal = 3 (slider from 0 to 5, step 0.1)
stap = 5 (slider from 0 to 5, step 1)
A = (0, -3)
c = Circle(A, straal)
B = Point(c)
f = Ray(B, A)
C = Point(c)
g = Ray(C, A)
D = Intersect(c, g, 2)
E = Intersect(c, f, 2)
h = Segment(C, A)
i = Segment(D, A)
j = Segment(A, E)
k = Segment(B, A)
l = Segment(E, C)
m = Segment(C, B)
n = Segment(B, D)
p = Segment(D, E)
α = Angle(C, A, E)
β = Angle(E, A, D)
γ = Angle(D, E, C)
δ = Angle(B, D, E)