Question

[huyvanvan]

Cho hai góc xoy và yot kê bu. Cho tia om là tia phân giac cua yot.Ve tia oz sao cho moz =90'.Chung minh tia oz là tia phân giac cua xoy

Answer 1

[Iceghost]

_{Ta có : \(\widehat{zOy}+\widehat{yOm}=90^o\)
\(\Rightarrow 2(\widehat{zOy}+\widehat{yOm})=180^o\)
\(\Rightarrow 2\widehat{zOy}+2\widehat{yOm}=180^o\)
\(\Rightarrow 2\widehat{zOy}+\widehat{yOt}=180^o\)
\(\Rightarrow 2\widehat{zOy}=180^o-\widehat{yOt}\)
\(\Rightarrow 2\widehat{zOy}=\widehat{xOy}\)
\(\Rightarrow \widehat{zOy}=\frac12\widehat{xOy}\)
\(\Rightarrow \)Oz là tia phân giác \(\widehat{xOy}\)}

 Đúng 0