Triangle PQR is to be drawn with the following data: PQ=6 cm, QR=5 cm and ∠PQR=45∘. Work out the tasks below.
(a) Using ruler and compasses only, construct △PQR with the given measurements.
(b) On the opposite side of QR, construct another triangle P′Q′R′ such that Q′R′=QR, Q′P′=QP and ∠P′Q′R′=45∘.
(c) Prove that △PQR≅△P′Q′R′ and state the specific congruence criterion that applies.