Let the first circle with the yellow box be the set of points
Let the second circle with the green box be the set of points
where M is a rotation matrix (orthogonal, determinant = 1).
Let L be the length of the line connecting the boxes and let x be the coordinates of the yellow box and x' be the coordinates of the the green box. Then for a given the solution(s) x to
"describes" the yellow box x in terms of the green box x'.