$C$ is the point on $\overleftrightarrow{DE}$ which is equally distant from lines $\overleftrightarrow{AE}$ and $\overleftrightarrow{DB}$. $\overleftrightarrow{AE}$ and $\overleftrightarrow{DB}$ are parallel lines. **Perform a rotation that proves alternate interior angles are always equal and select the option which best explains the proof.** [[☃ radio 1]] [[☃ transformer 1]]