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4 / sin C = a / sin A
4/ sin C = 6 / sin 80
sin C = 4. sin 80 / 6 = 0,6565
C = 41,03
sudut B = 180 - (41,03+80) = 58,96
luas = 1/2 ac sin B = 1/2. 4.6. sin 58,96 = 10,28 jika dibulatkan diatas menjjadi 10,3 yg mendekati adalah B