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12x=180x=15
∠Q= 3*15 = 45
∠P + ∠Q + ∠R = 180°
5x + 3x + 4x = 180
12x = 180°
x = 180 / 12
= 15°
∠P = 5x = 5 . 15
= 75°
∠Q = 3x = 3 . 15
= 45°
∠R = 4x = 4 . 15
= 60°