Vectors for Vector Subtraction Accepted Values for R R - 55.68 B = 70 50 OR= -74.370 = 105.63 A. Using a piece of graph paper, subtract vectors A and B: B - A = R. To start, draw A. Next, draw B, but at the origin of your coordinate system. That means the two vector's tails will be at the same point. Draw a vector from the tip of A to the tip of B. This is R. B. Draw the problem again, but this time draw -A + B. That means you will be drawing vector addition, but with A pointing 180 away from its original direction C. Use your ruler and protractor to measure the length and direction of R on your graph paper from each of the above cases. Record your measurements. D. On your graph paper you should also calculate the % difference between the accepted value of R, and the values that you measure on the graph paper. Record this on the graph paper as well