Question

1. which angles are congruent when two parallel lines are intersected by a transversal?

a. consecutive interior angles
b. same - side interior angles
c. alternate interior angles
d. supplementary angles

Explanation:

When two parallel lines are intersected by a transversal, alternate - interior angles are congruent. Consecutive interior and same - side interior angles are supplementary, not congruent. Supplementary angles are two angles that add up to 180 degrees and are not necessarily congruent in the context of parallel lines and a transversal.

Answer:

C. Alternate interior angles