SOLUTION
We are asked if
[tex]m\angle4=m\angle5[/tex]
which lines are parallel.
If
[tex]m\angle4=m\angle5[/tex]
then line r and line s are parallel, while line L is a transversal.
A transversal is a line that cuts two parallel lines.
Since line r and line s are parallel, then angle 4 and angle 5 are alternate angles. Alternate angles are always equal and congruent.
