a/SINA=b/SINB=c/SINC
(根号3)/SIN120°=(根号2)/SINB
SINB=(根号2)/2 B=45°
C=180°-120°-45°=15°
(根号3)/SIN120°=c/SIN15°
边c=2SIN15°=0.51764
a/SINA=b/SINB=c/SINC
(根号3)/SIN120°=(根号2)/SINB
SINB=(根号2)/2 B=45°
C=180°-120°-45°=15°
(根号3)/SIN120°=c/SIN15°
边c=2SIN15°=0.51764