Dik segitiga abc siku siku di B. Jika sisi ac=10 dan sudut c=30° maka panjang ab

Aturan sinus

AB/sin C = AC/sin B
AB/sin 30 = 10/sin 90
AB/ (1/2) = 10/1
2AB = 10
AB = 10/2
AB = 5 cm

Bab Trigonometri
Matematika SMA Kelas X

sin C = AB / AC
sin 30° = AB / 10
AB = 10 x 1/2
AB = 5