Vectors A and B each lie in the x-y plane. The magnitude of A + B equals the magnitude of A - B. Find the geometric relation between vectors A and B. (Hint: Express the vectors in unit-vector notation. Use your knowledge of dot products.) I really don't even know what this problem is asking. What is meant by the geometric relation? I'm not sure how dot products relate. What is my final answer going to be in terms of? Is it going to be an equation? A sentence? I'm really lost. Can someone break down what the objective of this problem is or how to start it?