Question: proofshow detail two lines are parallel and we have a...
Two lines are parallel and we have a non-perpendicular transversal. We assume conjecture 1 holds, which states that same-side interior angles are supplementary.
We can assume conjecture 2 holds, which states that alternate interior angles are congruent.
We cannot use alternate exterior angles are congruent and corresponding angles are congruent.
PROOF: Alternate exterior angles are congruent.