Question 184
Suppose that $A, B, C, D$ are four points in the plane, and let $Q, R, S, T, U, V$ be the respective midpoints of $A B, A C, A D, B C, B D, C D$. If $Q R = 2001$, $S U = 2002$, $T V = 2003$, find the distance between the midpoints of $Q U$ and $R V$.