vẽ hai góc kề bù \(\widehat{xoy}\)va \(\widehat{yoz}\),biet \(\widehat{xoy}\)= 50 do . ve tia oa la tia phan giac cua \(\widehat{xoy}\)
a, tinh so do \(\widehat{yoz}\)
b, ve tia ob la tia phan giac cua \(\widehat{yoz}\). tinh so do \(\widehat{aob}\)
c, tren cung mot nua mat phang bo la duong thang xz co chua tia oy,ve \(\widehat{zot}\)=50 do . hoi tia oy la tia phan giac cua \(\widehat{aot}\)khong ? vi sao ?