The best answer in my opinion is B. similar border laws because the border between america and canada has been shared for over 200 years and it is known as the international boundary. I would think this is the logical answer out of the choices given. If I am wrong I apologize let me know.
Think of it as two triangles. A square consists of a 45 45 90 triangle. So 1 would equal x root 2. Then you solve that equation and end up with (root 2)/2
