Le rapporteur trigonométrique

A = (2, 1)
a = 5.24 (slider from -5 to 20, step 0.01)
c = Circle(A, a)
G = Point(c)
H = Rotate(G, 224.50000000000003°, A)
I = Rotate(G, 134.5°, A)
J = Rotate(G, 314.50000000000006°, A)
d = Circle(A, a 2^(0.5) + 0.2)
b = Line(A, H)
e = Line(I, A)
B, C = Intersect(d, b)
D, E = Intersect(d, e)
f = true