In a parallelogram, the diagonals bisect each other. This means that each diagonal is divided into two equal parts at the point of intersection.
Given that the length of side \( SU \) is 11 inches, let's denote the lengths of the diagonals \( ST \) and \( UV \) crossing at point \( R \). Since \( R \) bisects both diagonals, we can say that \( SR \) is half of the diagonal \( SU \).
So, we can calculate the length of \( SR \):
\[ SR = \frac{SU}{2} = \frac{11 \text{ inches}}{2} = 5.5 \text{ inches} \]
Thus, the length of \( SR \) is 5.5 inches.