In the given figure, PQR is a triangle in which ∠P : ∠Q : ∠R = 8 : 5 : 2, and PR is perpendicular to RS. What will be the measure of ∠TRS?

96° 60° 85° 66°

66°

Here, ratio of angels; P : Q : R = 8 : 5 : 2 = 15 15 Unit = 180° 1 Unit = 12° P = 8 Unit = 96°, Q = 60° ∠PRT = ∠p + ∠Q (exterior angle of ΔPQR) ∠PRT = 96° + 60° = 156° ∠TRS = ∠PRT - ∠PRS = 156° - 90° = 66°