Question

Hi, I haveto get the angle of the total scattering of particles in rutherfords scattering, so far ive been able to simulate the rutherford scattering but i have not been able to get the angle, i know this angle can be given by sin^(-1)(theta)= change in y axis/ change in x axis. The problem is i dont know how to get this in matlab. any help would be much appreciated. ps the change in y is from top to bottom, ie negative and the change in x is from right to left, negative again. Thanks again for any help