In a parallelogram, the diagonals bisect each other. This means that the point of intersection, which is point R in this case, divides each diagonal into two equal segments.
Given that SU (which is one of the diagonals) is 11 inches, we can conclude that point R divides SU into two equal parts:
\[ SR = \frac{SU}{2} = \frac{11 \text{ inches}}{2} = 5.5 \text{ inches} \]
Therefore, the length of SR is 5.5 inches.