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LANGKAH KERJA
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35° + 2x° + 1 + x° + 18° = 180°
3x° + 54° = 180°
3x° = 126°
x = 126° ÷ 3°
x = 42°
∠A = x° + 18°
∠A = 42° + 18°
∠A = 60°
∠B = 2x° + 1°
∠B = 2 × 42° + 1°
∠B = 84° + 1°
∠B = 85°
∠C = 35
∠ABC = 180° - 85°
∠ABC = 95°
∠ACB = 180° - 35°
∠ACB = 145°
∠BAC + ∠ABC + ∠ACB = 180°
∠BAC + 95° + 145° = 180°
∠BAC + 240° = 180°
∠BAC = 240° - 180°
∠BAC = 60°
Jadi, besar ∠BAC adalah 60°
OPTION : B
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