I "III 1-S uN A ru.ll. MU 



; magnitude ami direction, by Alt. 1 



the resultant of this force and Z, that i.. of the 

 sented by AE t AD t i* represented in magnitude and direction 

 by Ab\ the diagonal of the parallelogram />/.' II .< t . 

 resultant represented in magnitude and direction 



by A F. Let * magnitude of the resultant, and 



the angles the direction of ft makes with those of 

 i, since 



fore TP 



v , -. - tr >' 



Also cos a = t ,,= 7 . , 



lo and direction of the resultant are rletsi 



follows from the lant Article that anr force R ibr 



i makes the angles a, b, c with three wet- 



lar axes ti \.--l in space, may be replaced by UM tarts 



forces R cosa v R cos b, ll cos c, acting simultaneously on the 



lo on ui.i.-ii A acts, and 

 o axes of coordinate* respcctiv 



