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48 =1/2 × 16 × 12 × Sin A
48 =8 × 12 × sin A
48 =96 sin A
48/96 = sin A
1/2 = sin A
sin 1/2 = 30°
maka besar sudut A = 30°
48 =½.16.12.sudut A
48= ½.192.sudut A
96.sudutA = 48
sudut A= 48/96
sudut A=0,5
sin 0.5 adalah sin 30°