Figuur I

straal = 3 (slider from 0 to 5, step 0.1)
A: (-9, -14)
c = Circle(A, straal)
B = Point(c)
f = Segment(A, B)
g = Line(B, A)
C = Intersect(c, g, 2)
h = Segment(A, C)
D = Point(c)
i = Segment(D, A)
j = Segment(D, B)
k = Segment(D, C)
α = Angle(C, D, A)
β = Angle(D, B, A)
γ = Angle(A, D, B)
δ = Angle(A, C, D)