1. Exemplar - Find the value of DE

In \(△ ABC\), \(AB =  9cm\), \(BC = 11 cm\) and \(AC = 7 cm\). If \(D\) and \(E\) are respectively the mid-points of \(AB\) and \(BC\), determine the length of \(DE\).

 

\(DE=\)\(cm\)