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Kelas 10 MatematikaBab Trigonometri
sin α = tinggi tiang / panjang kawat
sin 60° = 15 m / panjang kawat
Panjang kawat = 15 / (1/2 √3)
Panjang kawat = (2 . 15)/√3 . (√3)/(√3)
Panjang kawat = (30 √3)/3
Panjang kawat = 10√3 m