Ta có:
\(\left\{{}\begin{matrix}\widehat{AOC}=\widehat{BOD}=70^o\left(d.d\right)\\\widehat{BOC}=180^o-\widehat{AOC}=180^o-70^o=110^o\\\widehat{BOC}=\widehat{AOD}=110^o\left(d.d\right)\end{matrix}\right.\)
Vậy chọn đáp án D
80-80-989898]==60-60-8976=4-97;80-7=