diketahui segitiga ABC, sudut BAC = 15 ° sudut ABC =140° dan panjang AB = 5 cm. hitung panjang sisi AB, BC dan AC.

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BAC : 15°
ABC : 140°
AB : 5cm
BC :?
AC : ?

Sudut segitiga : 180°
maka sudut BCA : 180-140-15 : 25°

Aturan Sinus.
a/sin A = b/sin B = c/sin C
BC/sin BAC = AC/sin ABC = AB/sin BCA

BC/sin BAC = AB/sin BCA
BC/sin 15° = 5/sin 25°
BC = 5.sin15°/sin25° (dicari nilai sin-nya di kalkulator yaaa)

AC/sin ABC = AB/sin BCA
AC/sin140°=5/sin25°
AC = 5.sin140°/sin25° (dicari nilai sin-nya di kalkulator yaa)

Kalau boleh jadikan jawaban tercerdas ^^