a)\(\widehat{A4}=\widehat{B2}\) (so le trong)
\(\widehat{A1}=\widehat{B3}\) (so le trong)
Đồng vị : \(\widehat{A3}và\widehat{B3};\widehat{A4}và\widehat{B4};\widehat{B1}và\widehat{A1};\widehat{A2}và\widehat{B2}\)
b)\(\widehat{A1}và\widehat{A4}\) là 2 góc kề bù
\(\Rightarrow\widehat{A1}+\widehat{A4}=180^o\)
\(\Rightarrow\widehat{A4}=180^o-60^o=130^o\)
\(\widehat{A1}=\widehat{B1}\) (đông vị)
\(\Rightarrow\widehat{B1}=60^o\)
\(\widehat{B3}=\widehat{B1}\) (đối đỉnh)
\(\Rightarrow\widehat{B3}=60^o\)
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