Ta có: $\widehat{AOC}-\widehat{BOC}=68^{\circ}$; $\widehat{AOC}+\widehat{BOC}=180^{\circ}$ suy ra $\widehat{AOC}= 124^{\circ};\widehat{BOC}=56^{\circ}$
$\widehat{BOt}=\frac{1}{2}\widehat{BOC}=28^{\circ}$
Đáp án: C
Ta có: $\widehat{AOC}-\widehat{BOC}=68^{\circ}$; $\widehat{AOC}+\widehat{BOC}=180^{\circ}$ suy ra $\widehat{AOC}= 124^{\circ};\widehat{BOC}=56^{\circ}$
$\widehat{BOt}=\frac{1}{2}\widehat{BOC}=28^{\circ}$
Đáp án: C