Dalam segitiga ABC diketahui a= 10cm, sudut A=120° dan B=30°, Maka c=...

sudut C = 180° -(120+30)° = 180°-150° = 30°

a/sin A = c/sin C
10/sin 120° = c/sin 30°
10/(1/2√3) = c/(1/2)
1/2√3 x c = 10 x 1/2
1/2 √3 c = 5
√3 c = 10
c = 10/√3 x √3/√3
c = 10/3 √3