15. Four mark exercise problems VII

In a parallelogram \(PQRS\) (see the diagram) \(PM\) and \(PN\) are the heights corresponding to the sides \(QR\) and \(RS\) respectively. If the area of the parallelogram is \(900 \ sq. \ cm\) and the length of \(PM\) and \(PN\) are \(20 \ cm\) and \(36 \ cm\), respectively, find the length of the sides \(QR\) and \(SR\).

 

 

Answer:

 

\(QR =\)  \(cm\)

 

\(SR =\)  \(cm\)