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Yes, but not always because 2 right angles would also be supplementary adding to 180 degrees.
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two 90 degree angles or also known as supplementary angles
Any angle that is supplementary is also adjacent. Two examples of a set of adjacent, supplementary angles are: 89 degrees and 91 degrees; or 100 degrees and 80 degrees.
I think you mean vertical angles. Vertical angles are formed by two intersecting lines that make what looks like an X. Vertical angles are the two angles that are across from each other, either the top and bottom 2 angles or the left and right 2 angles. Vertical angles are also always congruent!