1. The problem statement, all variables and given/known data I´ll show it with a picture: 2. Relevant equations Static equilibrium, Sum Forces=0 ; Sum Moments= 0 3. The attempt at a solution With the Fx, and Fy equations I can calculate the reactions Rx and Ry but I don´t understand the moments equation: Sum M around point O =0= 1,4*1,2 + 15 - 3* cos(30)*4.8 = 4,2 KN m = 0 I didn´t use the moments of the reactions at O because I thought that their moment arms were zero, but in that case I get an equation that doesn´t have any sense. I can calculate the moments of the forces to the point O, and I can add the 15 Knm, but the point is in order to get equilibrium Should I consider the moments of the reaction forces at O? In that case why the problem is not giving me any data about the lenghts x,y,z that I showed near O?