Vì \(\Delta MNP\) cân tại P \(\Rightarrow\widehat{M}=\widehat{N}\)
Xét \(\Delta MNP\) ta có:
\(\widehat{M}+\widehat{N}+\widehat{P}=180^o\\ \Rightarrow\widehat{N}+\widehat{N}+3\widehat{N}=180^o\\ \Rightarrow5\widehat{N}=180^o\\ \Rightarrow\widehat{N}=36^o\)
\(\Rightarrow\widehat{M}=\widehat{N}=36^o\)
\(\widehat{P}=3\widehat{N}=3.36^o=108^o\)