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Verified answer
Jawab<B = 60
<C= 30
<A = 90
ABC siku siku di A
BC = 12
AB/BC = 1/2 --> AB = 1/2 BC = 6
luas ABC = 1/2 AB BC sin B
Luas ABC = 1/2 6. 12. sin 60
Luas ABC = 36 . 1/2√3
Luas ABC = 18 √3