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# Which angle is included between the sides overlineDE and overlineEF of bigtriangleup DEF?

1. Which angle is included between the sides $\overline{DE}$  and $\overline{EF}$ of  $\bigtriangleup DEF$?

Since both the sides  $\overline{DE}$  and $\overline{EF}$ intersects at E,
$\angle E$  is included between the sides $\overline{DE}$  and $\overline{EF}$ of  $\bigtriangleup DEF$.