1. The problem statement, all variables and given/known data Determine the magnitude and direction θ of F1 so that the resultant force is directed vertically upward and has a magnitude of 800N. 2. Relevant equations F1=FR-F2-F3 3. The attempt at a solution I have attached the question with diagram and my attempt at solving the question. I know that by using the equation above, F1=FR-F2-F3, however I am slightly confused as to obtaining the values for these vectors and how to approach doing that.