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Verified answer
Kelas 10 MatematikaBab Trigonometri
a / sin a = b / sin b
a / sin 45° = 18 / sin 60°
a = (18 . 1/2 √2) / (1/2 √3) . (√3)/(√3)
a = (18/3) . √6
a = 6 √6 cm