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bisa pake perbandingan istimewa untuk sudut 45⁰
AB : BC : AC = 1 : 1 : √2
AB : AC = 1 : √2
AB : 18 = 1 : √2
AB = 18 / √2
= 18 / √2 x (√2/√2)
= 9√2
= √162 (C)