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It is 120-degree angle are supplementary.
No. All linear pair angles are supplementary, but supplementary angles do not have to be a linear pair.
In geometry, supplementary angles add to 180 degrees. The term 'supplementary number' is not used in algebra.
Yes. Any two are supplementary.
All supplementary angles do not form a linear pair. The opposite angles of any quadrilateral inscribed in a circle (a cyclic quadrilateral) are supplementary but they are not a linear pair. However, all linear pair are supplementary.