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<B = 180-135
<B = 45
aturan sinus
AC / Sin <B = BC / Sin <A
AC / Sin 45 = 12 / sin 60
AC / 1/2√2 = 12 / 1/2√3
AC = 6√2 / 1/2√3
AC = 6√2.(2) / √3
AC = 12 √6 / 3
AC = 4√6 (C)