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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.
 
YCIND_230311_5086_TN7_measurement_12.png
 
Answer:
 
QR =  cm
 
SR =  cm