Ta có: MN//PQ \(\Rightarrow\widehat{M}+\widehat{Q}=180^0\) mà \(\widehat{M}-\widehat{Q}=40^0\).
\(\Rightarrow\left\{{}\begin{matrix}\widehat{M}=110^0\\\widehat{Q}=70^0\end{matrix}\right.\)
Mặt khác: \(\widehat{N}+\widehat{P}=180^0\) mà \(\widehat{N}=3\widehat{P}\)
\(\Rightarrow\left\{{}\begin{matrix}\widehat{N}=135^0\\\widehat{P}=45^0\end{matrix}\right.\)