1. The problem statement, all variables and given/known data Find the magnetic field of a rectangular current loop lying symmetrically on the xy-plane. Find the magnetic field at (0,0,z) 2. Relevant equations Biot-Savart law or derived formula (Mu/4*Pi) * sin(theta2)-sin(theta1)/s 3. The attempt at a solution I am NOT good with getting my trianges correctly. I know that B1=B3 and B2=B4 but I cannot figure out the values of the thetas!