Question

Дано: угол 1 = углу 2; угол 3=120° . Найти угол 4

Answer 1

po tozhdestvennosti uglov

ugol #4 = 120

ugol #4 = 180 - ugol c

ugol c = 180 - ugol 3

ugol c = 60

togda ugol 4 = 180 - 60 = 120

Answer 2

∠1=∠2 ⇒ n║m ⇒∠3=∠4=120°.