\(\left\{{}\begin{matrix}\widehat{A_4}=\widehat{A_2}=40^0\\\widehat{A_3}=\widehat{A_1}=180^0-\widehat{A_4}=140^0\end{matrix}\right.\)
\(\left\{{}\begin{matrix}\widehat{B_4}=\widehat{B_2}=40^0\\\widehat{B_3}=\widehat{B_1}=180^0-\widehat{B_4}=140^0\end{matrix}\right.\)