Question

Угол АОВ=15 BOD=135 COD=28 x=? DOE=?

Answer 1

∠AOE=180°

∠AOE=∠AOB+∠BOD+∠DOE=15°+135°+∠DOE=180°⇒

∠DOE=180°-150°=30°

(x-9)°=∠DOE=30°; x-9=30⇒x=39

Ответ: x=39

DOE=30°

Answer 2

∠DOE=X-9=180-(∠AOB+∠BOD)=180-(15+135)=30°

X-9=30 ⇒ X=39°