No, they can but usually will not.
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Angles that add up to 180 degrees are always supplementary
Nope. It is complementary angles that add to 90 degrees.
Angles aren't congruent. Equal angles do not add up to 90 degrees unless they are 45 degrees. Complementary angles, by definition, add up to 90 degrees.
The 3 interior angles of any triangle always add up to 180 degrees
The internal angles of a triangle always add up to 180 degrees.