In the given picture, we have two triangles Δ LMN and ΔOPQ.
Also it is given that in Δ LMN and ΔOPQ.
So by AAS theorem, we have
Δ LMN ≅ ΔOPQ.
AAS theorem says that if two angles and any side of a triangle are congruent to two angles and any side of another triangle then the two triangles are congruent.