Tolong dong no. 4 nya :)) Trigonometri

a) 6/sin B = 4/sin A
6/0,5 = 4/sin A
Sin A = 4/12 = ⅓
b) sin A = ⅓ mk sdt A = 19,5°
Sdt C = 180-30-19,5 = 130,5°
c) Luas ABC = ½ x AC x BC sin C = ½×6×4×sin 130,5 = 12 x 0,76 = 9,12 cm²