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⇒Sudut SPQ = 60° - 40° = 20°
⇒Sudut TQP = 60° - 35° = 25°
⇒Sudut PSQ = 180° - 20° - 60° = 100°
⇒Sudut QTP = 180° - 60° - 25° = 95°
⇒Sudut QTR = 180° - 95° = 85°
⇒Sudut PSR = 180° - 100° = 80°
Sehingga :
⇒Sudut SXT = 360° - 60° - 85° - 80° = 135°