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∠A = 30°
∠C = 120°
∠B
= 180° - ∠A - ∠C
= 180° - 30° - 120°
= 30°
Luas Segitiga
= AB² . sinA . sin B / (2 . sinC)
= 6² . sin30° . sin30° / (2 . sin120°)
= 36 . 1/2 . 1/2 / (2 . 1/2√3)
= 9 / √3
= 3√3 cm² (D)
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