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A

ansinhv2

K

khaiproqn81

$\widehat{ABK}=\widehat{ACH}$ chứ gì :-SS

Trong $\triangle ABK$ có:

$\hat{A}+\widehat{ABK}+\widehat{AKB}=180^o$

Trong $\triangle ACH$ có:

$\hat{A}+\widehat{ACH}+ \widehat {AHC}=180^o$

$\Longrightarrow \hat{A}+\widehat{ABK}+\widehat{AKB}=\hat{A}+\widehat{ACH}+\widehat{AHC} \\ \Longrightarrow \widehat{ABK}=\widehat{ACH}$
 
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