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y=panjang kawat
panjang kawat = tinggi tiang / sin 60
panjang kawat = 8 / (1/2 √3) --> 1/2 √3 = 0,86
panjang kawat = 8 / 0,86
panjang kawat = 9,3 m (dibulatkan mjdi 9 m)
jawaban: b
semoga membantu ya :)