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• x = 70°
• 180° = 130 + y
• y = 50°
• 180° = x + y + sdt A
• 180 = 70+50+ sdt A
• sudut A = 180-120
• sudut A = 60°
∠ A = 180° - ∠ B - ∠ C
= 180° - (180 - 130)° - (180 - 110)°
= 180° - 50° - 70°
= 60°