3) Ta có: \(\widehat{mOt}+\widehat{mOy}=90^0\)
\(\Leftrightarrow\widehat{yOm}+45^0=90^0\)
hay \(\widehat{yOm}=45^0\)
1) Ta có: Oz là tia phân giác của \(\widehat{xOy}\)(gt)
nên \(\widehat{xOz}=\dfrac{\widehat{xOy}}{2}=\dfrac{90^0}{2}\)
hay \(\widehat{xOz}=45^0\)
Vậy: \(\widehat{xOz}=45^0\)
2) Ta có: \(\widehat{xOz}+\widehat{tOz}=180^0\)(hai góc kề bù)
\(\Leftrightarrow\widehat{tOz}+45^0=180^0\)
hay \(\widehat{tOz}=135^0\)
Vậy: \(\widehat{tOz}=135^0\)