Answer :

In triangle PQR,


QPR + PQR + PRQ = 180°[Sum of angles of triangle]


QPR + 65° + 90° = 180°


QPR + 155° = 180°


QPR = 25°______________ (i)


In triangle PMQ,


QPM + PMQ + PQM = 180°[Sum of angles of triangle]


QPM + 90° + 50° = 180°


QPM + 140° = 180°


QPM = 40°


Now,


PRS = QPR = 25°[Alternate angles]


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