1. The problem statement, all variables and given/known data Please see attached picture 2. Relevant equations principal of moments 3. The attempt at a solution part a) is fine. For part b, I would Normally take moments about C. The force acting on BC at B must be the tension in AB. The geometry of the triangle gives and angle of 53.1 to the horizontal, and moments gives a force of 250N. However the solution in my book says 290N at and angle of 43.6 degree to the horizontal, so I'm not sure if I have missed something, taking into account compressive tension along BC doesn't seem to work. Any pointers would be appreciated.