`\text{-So le trong:}`$\widehat{A3}$=$\widehat{B4}$;$\widehat{A2}$=$\widehat{B2}$
`\text{-Đồng vị:}`$\widehat{A2}$=$\widehat{B1}$;$\widehat{A4}$=$\widehat{B4}$;$\widehat{A3}$=$\widehat{B3}$;$\widehat{A1}$=$\widehat{B2}$
$\text{-Trong cùng phía:}$$\widehat{A2}$và $\widehat{B4}$;$\widehat{A3}$và $\widehat{B2}$
$\text{#Trang}$