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Find the area of the quadrilateral water tank \(PQRS\), if \(OQ =\) 19 \(cm\), \(PR =\) 25 \(cm\), and \(SM =\) 6 \(cm\).
 
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Area of the quadrilateral water tank \(=\)  \(cm^2\)
 
[Note: Round off the answer obtained to the nearest whole number]