\(\widehat{E_1}=\widehat{C_7}=60^o\)(hai góc so le trong do d'//d")
\(\widehat{G_2}=\widehat{D_3}=110^o\)(hai góc đồng vị do d'//d")
\(\widehat{G_3}=180^o-\widehat{G_2}=180^o-110^o=70^o\)(hai góc kề bù)
\(\widehat{D_4}=\widehat{D_3}=110^o\)(hai góc đối đỉnh)
\(\widehat{A_5}=\widehat{E_1}=60^o\)(hai góc đồng vị do d//d")
\(\widehat{B_6}=\widehat{G_3}=70^o\)(hai góc đồng vị do d//d")