2.2 Three forces balancing unknown weight 2 (18 points) Known Weights Magnitude Directions 0 deg 550 g A 400 g 135 deg B 200 g 180 deg C Unknown 2 3. Find unknown weight 1 using graphical method (16 points) 3.1 Set up a scale. 3.2 Use a ruler and a protractor to draw an angle using of force A and force B as two sides, according to the scale. 3.3 Use the parallelogram method to find the sum of A+ B, which is the experimental value of the magnitude of unknown weight 1.