Bantuin jawab dong kak

diket = busur AB = 21 cm
            busur CB = 6 cm
            ∠AOB      = 105°

dit = ∠BOC?

jwb = 

busur AB/ busur BC = ∠AOB / ∠COD

21 / 6 = 105 / ∠BOC

∠BOC = 105 X 6 / 21

∠BOC = 30°