It is to be established by RHS congruence rule that △ABC≅△RPQ. What additional information is needed, if it is given that ∠B=∠P=90o and AB=RP?
For two right angle triangles to be congruent, we need to show two corresponding parameters as equal, with one of them as side for sure.
Since,ΔABC≅ΔRPQandAB=RPAny one of these conditions is required: AC=RQBC=PQ∠BAC=∠PRQand∠ACB=∠RQP