A = (-2, 5)
B = (-1, 5)
C = (0, 5)
D = (1, 5)
E = (2, 5)
F = (3, 5)
G = (4, 5)
Fliege = (0, 0)
a = Segment(A, Fliege)
b = Segment(B, Fliege)
c = Segment(C, Fliege)
d = Segment(D, Fliege)
e = Segment(E, Fliege)
I = (2, 0)
f = Segment(F, I)
g = Segment(G, I)
J = (-2, 0)
h = Segment(A, J)
K = (4, 0)
i = Segment(G, K)
z = 7 (slider from 0 to 7, step 1)
Spinne = Point(Circle[A, z])
j = Segment(A, Spinne)
k = Segment(F, Fliege)
l = Segment(G, Fliege)
α = Angle(c, j)