Here, △ABC and △PQR are congruent by SAS rule. Pair the congruent parts.
If two right-angled triangles have their hypotenuses and one side equal, then the two triangles are congruent by SAS congruence rule.
In triangle DEF and PQR, DE = PQ, EF = QR. ∠E = ∠Q. so the triangles are congruent using.