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In the following figure, \(ABCD\) is a rhombus. Diagonals \(AC\) and \(BD\) intersect at \(O\). \(E\) and \(F\) are mid-points of \(OA\) and \(OB\) respectively. If \(AC\) \(=\) 36 \(cm\) and \(BD\) \(=\) 48 \(cm\), then \(EF\) is:
 
A28.png
 
The value of \(EF\) \(=\)  \(cm\)