1. The problem statement, all variables and given/known data The resultant of vectors A and B has a magnitude of 20 units. A has a magnitude of 8 units, and the angle between A and B is 40 degrees. Calculate the magnitude of B. 2. Relevant equations Trig, resolving vector components. 3. The attempt at a solution I worked out the equations and got |B| = 13.20 units. But, this isn't any of my choices. Am I right, or am I missing something here?