Ta có: \(\widehat{xOy}=60^o\)
⇔ \(\widehat{xOz}+\widehat{zOy}=60^o\)
Mà \(\widehat{xOy}=3.\widehat{zOy}\)
⇒ \(4.\widehat{zOy}=60^o\)
⇔ \(\widehat{zOy}=15^o\)
⇒ \(\widehat{xOz}=3.15^o=45^o\)
Lại có: \(\widehat{xOt}=10.\widehat{zOy}\)
⇔ \(\widehat{xOt}=150^o\)
Ta có: \(\widehat{tOz}=\widehat{xOt}-\widehat{xOz}\)
⇔ \(\widehat{tOz}=150^o-45^o\)
⇔ \(\widehat{tOz}=105^o\)