tolng dibantu ya mau dikumpul besok

sudut A = 180 - 60 / 2 = 120/2=60

AB/(sin C) = BC/(sin A)
(7√3)/(sin 60°) = (7√2)/(sin A) ====> 7 coret
(√3)/(1/2 √3) = (√2)/(sin A) ====> √3 coret
1/(1/2) = (√2)/(sin A)
sin A = 1/2 √2
Sin A = sin 45°
A = 45°