Subtended Angle due to Magnetic Field

[BrainFood]

Homework Statement

Homework Equations

I have no idea where to start

The Attempt at a Solution

Similarly. If someone could give me some direction to solve this I would really appreciate it.

 

[TSny]

We require some indication of effort before giving help. For example, you should at least be able to tell us something about the magnetic fields at the center of the arc produced by the two currents.

What is the direction of B₁ at the center of the arc that is produced by current #1? Similarly, what is the direction of B₂ at the center of the arc that is produced by current #2?