Complete the proof. Given s||r - Prove <1 and <3 are supplementary

Question

<-------\1---------->s

2 \

\

\

<------------3\--------->r

\

Answer 1

Some statements to use:

∠1 and ∠2 are vertical angles. What about their measures?

∠2 and ∠3 are same side interior angles. What about their measures?

Then use Transitive Property of Equality.