a) Ta có:\(\widehat{xOz}+\) \(\widehat{zOt}\)\(=\widehat{xOt}\)
\(\Rightarrow\)\(\widehat{xOz}<\widehat{xOt}\)
\(\Rightarrow Oz\) nằm giữa \(Ox\) và \(Ot\)
b) Ta có: \(\widehat{xOy}=\)\(120^0\) \(\left(gt\right)\)
và \(\widehat{xOz}+\widehat{yOt}=\)\(80^0\)
\(\Rightarrow\)\(\widehat{zOt}=\widehat{xOy}-(\widehat{xOz}+\widehat{yOt})\)
\(=120^0-80^0\)
\(\Rightarrow\)\(\widehat{zOt}\)\(=40^0\)
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