It's when they're congruent and equal 180 degrees.
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if two angles are supplements of the same angle (or of congruent angles), then the two angles are congruent.
Angles that are congruent and supplementary must be right angles.
No, a pair of angles that are supplementary will always have a sum of 180 degrees, while a pair of angles that are congruent will have the same measure. Therefore, it is not possible for a pair of angles to be both supplementary and congruent.
congruent
Congruent *apex