I know what the net forces angle and magnitude is... I need to find the magnitude of the original forces(3 of them) which are added to get the net force; All the original forces are at fixed poistions and I do know their Angles; How would I find the the original forces magnitude's?
Well the forces are probably concurrent, so simply decompose into their components and the resultant force into their components too, and make nxn system of equations (n = number of components).