I failed this quiz, and I'm trying to understand b. I need to calculate the magnitude of force P which is necessary to create the same moment (I think it's torque in English?) about point B, knowing that alpha is 10 degrees. The moment in part a was -80Nm. I now understand that I should have used the following equation: M (about point B) = P * r * sin θ 80 Nm = P (0.5m) sin θ However, I don't understand where theta is. How do I find theta in general for this equation? My TA wrote 120°, but I don't understand how to get this number. My FBD is below, and I wrote my guess at where θ is, but my guess can't be correct. Help me find theta, please.