$L$ is the point on $\overleftrightarrow{MN}$ which is equally distant from lines $\overleftrightarrow{JN}$ and $\overleftrightarrow{MK}$. $\overleftrightarrow{JN}$ and $\overleftrightarrow{MK}$ 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]]