RA = 5.8 (slider from 0 to 10, step 0.01)
A = (-2, 0)
B = (4, 0)
c = Circle(A, RA)
SUM = 8 (slider from 0 to 10, step 0.1)
d = Circle(B, SUM - RA)
D, E = Intersect(d, c)