[Toán 7] Hình học

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peheo.lady

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me0kh0ang2000

Theo đề bài, ta có:

$\widehat{tOy}=\frac{1}{2}\widehat{xOy}$

$\widehat{yOt'}=\frac{1}{2}\widehat{yOz}$

\Rightarrow$\widehat{tOy}+\widehat{yOt}=\frac{1}{2}(\widehat{xOy}+\widehat{yOz})$

\Leftrightarrow$\widehat{tOt'}=90^0$
 
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