Question

giúp mình vs ạ

Answer 1

Ta có : a // b => \(\widehat{N_1}=\widehat{M_2}\)mà \(\widehat{M_1}+\widehat{M_2}=180^o\)( 2 góc kề bù )

=> \(\widehat{M_1}+\widehat{N_1}=180^o\Rightarrow\widehat{M_1}+105^o=180^o\Rightarrow\widehat{M_1}=180^o-105^o=75^o\)

=> Chọn B