На рисунке \(\displaystyle SK=EM{\small,}\) \(\displaystyle \angle SMK=\angle EKM=90^{\circ}{\small.}\) Найдите длину отрезка \(\displaystyle SM{\small,}\) если \(\displaystyle EK=7{\small.}\)

\(\displaystyle SM=\)[ ]\(\displaystyle {\small.}\)