# <span lang="EN-US

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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