segitiga ABC dengan siku siku di B, panjang AB=3 cm dan besar sudut C=30°.Panjang sisi AC adalah...

AB= c=  3 cm 
Sudut diket= C=30°; B=90°
(Aturan Sinus)
a/SinA = b/Sin B = c/SinC
= b/SinB = c/SinC
= b/Sin90° = 3/Sin30°
= b/1= 3/1/2
= b= 3.1/ 1/2
= 6 cm