Hai góc

Câu hỏi: Hai góc $\widehat{xOy}$ và $\widehat{zOy}$ là hai góc kề bù và $\widehat{xOy}-\widehat{zOy}=80°$ ta có:

A. $\widehat{xOy}=120°;\widehat{zOy}=40°$

B. $\widehat{xOy}=110°;\widehat{zOy}=30°$

C. $\widehat{xOy}=140°;\widehat{zOy}=60°$

D. $\widehat{xOy}=130°;\widehat{zOy}=50°$