A = (-0.9400000000000001, 2.54)
B = (2.72, 1.98)
C = (1.12, -1.3)
D = (-1.52, 0.08)
a = 1 (slider from -5 to 5, step 0.1)
α = Angle(A, D, C)
E = (-0.6, 1.12)
F = (-2.14, 1.76)
c = Circle(E, F)
G = (2.52, 1.1)
H = (0.8, 1.62)
d = Circle(G, H)