Question

what does it mean if two angles are congruent?
if two parallel lines are cut by a transversal, then corresponding angles are congruent.
the set of all points in a plane that are the same distance from a given point called the center
is a quadrilateral with two pairs of parallel sides its opposite sides are both parallel and congruent
angles that have the same measure

Explanation:

We need to identify the definition of congruent angles among the options. The other options describe a theorem about parallel lines, the definition of a circle, and properties of a parallelogram, respectively, which are unrelated to the core meaning of congruent angles.

Answer:

angles that have the same measure