\(a//b\Rightarrow\widehat{M_4}=\widehat{N}=70^o\) (2 góc so le trong)
\(\widehat{M_4}+\widehat{M_3}=180^o\) (2 góc kề bù)
\(\Rightarrow\widehat{M_3}=180^o-70^o=110^o\)
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