\(\widehat{N}=\dfrac{180^0-50^0}{2}=65^0\)
\(\Delta MNP\) cân tại M \(\Rightarrow\widehat{P}=\widehat{N}\Rightarrow\widehat{P}+\widehat{N}=2\widehat{N}\)
Do tổng 3 góc trong tam giác bằng 180 độ
\(\Rightarrow\widehat{P}+\widehat{N}+\widehat{M}=180^0\)
\(\Rightarrow2\widehat{N}+50^0=180^0\)
\(\Rightarrow2\widehat{N}=130^0\)
\(\Rightarrow=65^0\)