whereL=length of member between work points at truss chord centerlines, in. (mm) Lc=effective length of the member for buckling about the minor axis, in. (mm)bl=length of longer leg of angle, in. (mm)bs=length of shorter leg of angle, in. (mm)ra=radius of gyration about the geometric axis parallel to the connected leg, in. (mm)rz=radius of gyration about the minor principal axis, in. (mm)