Câu hỏi của kimcherry

\(\widehat{A_1}+\widehat{A_2}=180^o\) ( kề bù )\(\Rightarrow\widehat{A_1}+4\widehat{A_1}=180^o\\ \Rightarrow5\widehat{A_1}=180^o\\ \Rightarrow\widehat{A_1}=180^o:5=36^o\)mà \(m//n\)\(\Rightarrow\widehat{A_1}=\widehat{B_1}=36^o\)Câu trả lời: \(\widehat{A_1}+\widehat{A_2}=180^o\) ( kề bù )\(\Rightarrow\widehat{A_1}+4\widehat{A_1}=180^o\\ \Rightarrow5\widehat{A_1}=180^o\\ \Rightarrow\widehat{A_1}=180^o:5=36^o\)mà \(m//n\)\(\Rightarrow\widehat{A_1}=\widehat{B_1}=36^o\)