Answer:
SAS Congruence Postulate
Explanation:
Given RN=NQ and MN=PN
Also if we clearly observe we can say that ∠MNR=∠PNQ (When two lines meet the opposite angles are equal).
By SAS congruence postulate we can say that ΔRMN and ΔQNP are congruent.
SAS congruency postulate states that if two sides along with the included angle are equal of two triangles then those two triangles are congruent.