Ta có: $\widehat{ABH}=90^{\circ}-\widehat{A}$
$\widehat{ACK}=90^{\circ}-\widehat{A}$
Do đó $\widehat{ABH}=\widehat{ACK}$
Đáp án: B
Ta có: $\widehat{ABH}=90^{\circ}-\widehat{A}$
$\widehat{ACK}=90^{\circ}-\widehat{A}$
Do đó $\widehat{ABH}=\widehat{ACK}$
Đáp án: B