These are correct statements:
- Line segments AB and CD are parallel.
- Since ∠1 and ∠3 are corresponding angles, they are congruent.
These are incorrect statements:
- Since ∠3 and ∠4 are corresponding angles, they are congruent. They are not corresponding angles, they are supplementary meaning they, together, equal 180.
- Since ∠1 and ∠2 are corresponding angles, they are congruent. These are also not corresponding, they are supplementary.
- Line segments AB and CD are perpendicular. They are not crossing over each other.
- Since ∠1 and ∠4 are alternate interior angles, they are congruent. They are not corresponding, they are supplementary. ∠1 and ∠3 are corresponding just like ∠2 and ∠4.