QS and RT are the altitudes at triangle PQR .qs is equal to rt .
Is triangle PQS congruent to triangle SQR.by which congruence condition.<<<<<<????

PQS and SQR can not be proved as congruent.
But, we can prove that QRS RQT.
In QRS and RQT,
QS = RT  (given)
QR = RQ  (common side)
QSR = QTR  (90°)
Hence, QRS RQT  (RHS congruence criterion)

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