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Verified answer
Jawabluas ΔABC = 18
BC = 4
AB = 6√3
Luas = 1/2 BC. AB sin B
18 = 1/2 (4)(6√3) sin B
18 = 12√3 sin B
sin B = 18(12 √3)= 1/2 √3
i) sin B = 1/2 √3 = sin 60
B = 60
ii) sin B = 1/2 √3 = sin (180-60) = sin 120
B = 120