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Diagonals \(AC\) and \(BD\) of a parallelogram \(ABCD\) intersect each other at \(O\). If \(OA =5  cm\) and \(OD =4  cm\), determine the lengths of \(AC\) and \(BD\).
 
\(AC=\) \(cm\)
 
\(BD=\) \(cm\)