Question

Answer 1

+) Vì \(Ot\) là tia phân giác của \(\widehat{xOy}\)
nên \(\widehat{xOt}=\widehat{tOy}=\dfrac{\widehat{xOy}}{2}=\dfrac{150^o}{2}=75^o\)
+) Vì \(\widehat{xOy}\) và \(\widehat{yOx'}\) là 2 góc kề bù
nên \(\widehat{xOy}+\widehat{yOx'}=180^o\)
       \(150^o+\widehat{yOx'}=180^o\)
                   \(\widehat{yOx'}=180^o-150^o\)
                   \(\widehat{yOx'}=30^o\)
+) Vì \(\widehat{tOy}\) và \(\widehat{yOx'}\) là 2 góc kề nhau
nên \(\widehat{tOx'}=\widehat{tOy}+\widehat{yOx'}\)
       \(\widehat{tOx'}=75^o+30^o\)
       \(\widehat{tOx'}=105^o\)