Ответ:
1. ∠AOB = 150°. ∠AOC - ∠BOC = 70°. ∠AOC = ∠BOC + 70°.
2. ∠AOB = ∠AOC + ∠BOC.
3. 150° = (∠BOC + 70°) + ∠BOC. 150° = 2∠BOC + 70°. 2∠BOC = 80°. ∠BOC = 40°, ∠AOC = 40° + 70° = 110°.
2. ∠AOB = ∠AOC + ∠BOC.
3. 150° = (∠BOC + 70°) + ∠BOC. 150° = 2∠BOC + 70°. 2∠BOC = 80°. ∠BOC = 40°, ∠AOC = 40° + 70° = 110°.
