$\textit{a)}$ $\widehat{I1}$ = $105^o$

 $\rightarrow$ $\widehat{Q1}$ = $105^o$ (hai góc so le trong)

$\textit{b)}$ $\widehat{K1}$ = $72^o$

 $\rightarrow$ $\widehat{E1}$ = $72^o$ (hai góc so le trong)

$\textit{c)}$ $\widehat{A1}$ = $68^o$ 

$\rightarrow$ $\widehat{B1}$ = $68^o$

$\textit{d)}$ $\text{?}$

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