9. Fill in the blanks

 

\(ABCD\) is a quadrilateral with diagonal \(AC\) in which \(P\), \(Q\), \(R\) and \(S\) are mid-points of the sides \(AB\), \(BC\), \(CD\) and \(DA\). If \(AC\) is 15 \(cm\):

 

(i) The length of \(PQ\) \(=\)  \(cm\)

 

(ii) The sum of the lengths of \(SR\) and \(PQ\) \(=\)  \(cm\)

 

[Note: Insert decimal point if necessary.]