Which of the following pairs of triangles are congruent ? In each case, state the condition of congruency:
(a) In ΔABC and ΔDEF, AB=DE,BC=EF and ∠B=∠E .
(b) In ΔABC and ΔDEF, ∠B=∠E= 900, AC=DF and BC=EF.
(c) In ΔABC and ΔQRP , AB=QR, ∠B=∠R and ∠C=∠P .
(d) In ΔABC and ΔPQR , AB=PQ,AC=PR and BC=QR.
(e) In ΔABC and ΔPQR , BC=QR, ∠A= 90∘, ∠C= ∠R= 40∘ and ∠Q=50∘.
Question 5 In the following figure, DE||OQ and DF||OR, show that EF||QR.