c) \(\widehat{A1}=\widehat{B1}\)(là 2 góc so le trong)
Mà \(\widehat{B1}=50độ\)
\(\Rightarrow\)\(\widehat{A1}=50độ\)
Vì \(\widehat{A1}+\widehat{A2}=180độ\)(2 góc kề bù)
Hay 50độ + \(\widehat{A2}\) = 180 độ
\(\widehat{A2}\) = 180độ - 50độ
\(\widehat{A2}\) = 130độ
Vậy \(\widehat{A1}=50độ\)
\(\widehat{A2}\) = 130độ