Congruent angles always add up to 180 degrees.
The above answer is so wrong.
Congruent angles are angles of the same measure. They can have any value and so can add to any number. For example, the six interior angles of a regular hexagon are 120 degrees each and they add to 720 degrees.
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They can be but not always because supplementary angles add up to 180 degrees.
Complimentary angles ARE NOT always congruent. However, if one angle is 45 degrees, then they would be congruent since the other would have to be 45 degrees to add up to 90 degrees.
Not always. If two angles are congruent then they simply have equal measure. They must only be right angles if they are supplementary, that is, they must both add up to 180 degrees.
A single angle can only add up to its own value! And how can a single angle be congruent? There have to be at least two angles for them to be congruent (or not).
In a Linear Pair the 2 angles add up to 180 degrees while Vertical Angles are just 2 vertical angles that are congruent.