In the given figure, \(PS =\) 2 \(cm\), \(PO =\) 1.2 \(cm\), \(PT =\) 2.8 \(cm\), \(PQ =\) 8 \(cm\) and \(PR =\) 11.2 \(cm\). Find the length of \(PM\).
 
13.svg
 
The length of \(PM\) is  \(cm\).
 
(Note: Write in decimal places if necessary.)