In ∆ ABC ∆ PQR , angle A=angle Q and angle B= angle R . Which side of

This question was asked in Ex 7.1, 4

In ∆ ABC ∆ PQR , angle A=angle Q and angle B= angle R . Which side of ∆PQR should be equal to the side AB of ∆ABC, so that two triangles become congruent ? Give reason to your answer