Just call them "congruent angles".
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if two angles are supplements of the same angle (or of congruent angles), then the two angles are congruent.
No, not all angles in a trapezoid are congruent. A trapezoid may have two pairs of congruent angles, or may have no congruent angles.
The two angles are congruent. They are congruentangles. Congruent is basically 'same' in math. We often say congruent shapes, congruent, angles, and congruent sides.
If they have identical sides and angles then they are congruent
If their measures are equal, then the two angles are congruent.