A sailboat racecourse consists of four legs, defined by the displacement vectors A, B, C, and D as the drawing indicates. The magnitudes of the first three vectors are A -3.20 km, B-5.10 km, and C 4.80 km. The finish line of the course coincides with the starting line. Using the data in drawing, find the distance of the fourth leg and the angle ? 23.0 35.0Q Finish-L-Start