Chapter 12, Problem 52PQ

Given a vector $\stackrel{\to }{A}=4.5î+4.5\hat{j}$ and a vector $\stackrel{\to }{B}=-4.5î+4.5\hat{j}$, determine the magnitude of the cross product of these two vectors, $\stackrel{\to }{A}\times \stackrel{\to }{B}$. Hint: Make a sketch of both vectors including a coordinate system.