If m∠PSQ=25, then PQRS is a parallelogram.
In a quadrilateral, if opposite angles are equal, then the quadrilateral is a parallelogram.
In quadrilateral PQRS, if m∠RQS = m∠PSQ, then the opposite angles are equal, and PQRS is a parallelogram.
Given that m∠RQS=25 and PS = QR, you can use the fact that opposite angles in a parallelogram are equal.
Therefore, m∠PSQ should also be equal to m∠RQS, which is 25.
So, if m∠PSQ=25, then PQRS is a parallelogram.