Question

помогите решить задачу!!!​

Answer 1

∠ АВN = 153°  

∠ MBC = 120°

∠ MBN = ?

∠ NBC = ∠ ABC - ∠ ABN = 180 - 153 = 27°

∠ MBN = ∠MBC + ∠ NBC = 120 + 27 = 147°

Ответ: ∠ MBN = 147°