Diketahui Segitiga ABC dengan panjang sisi BC=35cm. Jika sudut A=30° dan sudut B=45° maka panjang sisi AC adalah?

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Diketahui Segitiga ABC dengan panjang sisi BC=35cm. Jika sudut A=30° dan sudut B=45° maka panjang sisi AC adalah?

Aturan Sinus

∆ABC

BC/sin A = AC/sin B

AC = BC × sin B / sin A

AC = 35 × sin 45° / sin 30°

AC = 35 × 1/2 √2 / 1/2

AC = 35√2 cm

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BC = 35 cm

∠ A = 30°

∠ B = 45°

Gunakan Aturan Sinus

large frac{BC}{sin:A} = frac{AC}{sin:B}

large frac{35}{sin:30°} = frac{AC}{sin:45°}

large frac{35}{frac{1}{2}} = frac{AC}{frac{1}{2} sqrt{2}}

large frac{1}{2} AC = 35 × frac{1}{2} sqrt{2}

large frac{1}{2} AC = frac{35}{2} sqrt{2}

large AC = frac{35}{2} sqrt{2} ÷ frac{1}{2}

large AC = frac{35}{cancel{2}} sqrt{2} × cancel{2}

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largebigstar Detail Jawaban largebigstar

▪ Mapel : Matematika

▪ Cabang : Geometri

▪ Materi : Trigonometri ; Aturan Sinus

▪ Kelas/Jenjang : 10 SMA

▪ Kata Kunci : Sinus, Segitiga

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