Answer:
∠11 and ∠14 are supplementary.
Explanation:
Angles 11 and 14 are supplementary by the same side interior angles theorem.
The same side interior angles theorem state that the angles on the same side of the transversal and are within the parallel lines are supplementary, meaning both their angles combined together form to make a straight angle equal to 180 degrees. The same side interior angles are angles formed between two parallel lines of a transversal and lie on the same side as previously mentioned. Additionally, we can see that angles 11 and 14 are same side interior angles, so by the same side interior angles theorem we can say that they are supplementary.