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a / Sin A = b / Sin B
8 / Sin 45 = 4√2 / Sin B
(Metode Kali Silang)
4√2 x Sin 45 = 8 x Sin B
4√2 x 0,5√2 = 8 x Sin B
4 = 8 x Sin B
Sin B = 0,5
B = Asin(0,5)
B = 30°
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