I would like to know if is possible calculate the area between 2 rings with opposite centers and the same radius, that is:
$$r_1^2<(x-a)^2+(y-b)^2<r_2^2$$ $$r_1^2<(x+a)^2+(y+b)^2<r_2^2$$
I think that depend on the relation between center and radius, but I'm not sure.
I'm working on...
Edit:
This is an example
$$4<(x-1){}^2+(y-2){}^2<8$$
$$4<(x+1){}^2+(y+2){}^2<8$$
