Chapter 3, Problem 10Q

Figure 3-25 shows vector $\stackrel{\to }{A}$ and four other vectors that have the same magnitude but differ in orientation, (a) Which of those other four vectors have the same dot product with $\stackrel{\to }{A}$? (b) Which have a negative dot product with $\stackrel{\to }{A}$?

Figure 3-25 Question 10.