1. The problem statement, all variables and given/known data To make it easier on the people who will try to help me, I've scanned the problem: We are interested in finding the following variables: Angles a and c The tension between A and B (TAB) 2. Relevant equations The pulley is a "perfect pulley" no friction The system is at equilibrium We consider on side A that the string is attached to the wall, or a hook, it's fixed. All three cords are attached to a ring situated at position B There is nothing between A and C, but we know there is 3 meters of distance between the two 3. The attempt at a solution Alright so I decided to make a Free Body Diagram taking the ring as the subject. It goes like that: Considering the pulley, I guess we can assume that TBC is going to to be the same as FA. After that I decided to decompose each of the three forces, and since everything is at equilibrium, I've come with two equations (again in picture, gonna be easier): At that point I am stuck because I don't see any more equations involving those three unknown variables(a,c, TAB) I can do. So I have 3 unknown variables but only two equations. Could someone please help me out?