Given:
[tex]\begin{gathered} m\angle C+m\angle F=180\degree \\ m\angle C+77=180\degree \\ m\angle C=180\degree-77\degree \\ m\angle C=103\degree \end{gathered}[/tex][tex]\begin{gathered} m\angle D+m\angle E=180\degree \\ 121+m\angle E=180 \\ m\angle E=180-121 \\ m\angle E=59\degree \end{gathered}[/tex]
