If u then u with direction angle tan 2 placed in the appropriate quadrant Dot Product of Two Vectors in the Plane and v v u v U V Angle Between Two Vectors and v cos 1 2 refer to the vectors u 3 4 and 3 2 1 Graph and label on the grid the vectors u v 20 an 10 4 5 9 8 7 6 4 3 2 0 1 10 9 8 7 6 5 4 3 2 1 1 2 5 6 0 1 2 3 V v 4 E 5 6 7 8 9 10