This question could be argued over and over. However, my interpretation of "supplementary" is TWO angles add up to be 180. However, there are THREE angles in a triangle, so the angles of a triangle, although they add up to 180, are not supplementary.
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No, because the sum of the 3 angles of a triangle always equals 180 degrees. If two angles are supplementary by definition the two together already sum to 180 degrees, leaving no "space" for the third angle.
No. The adjacent angles are supplementary.
If all of the angles add to 180 degrees the figure is a triangle. * * * * * That is if they form a plane figure. Angles that add to 1890 degrees are called supplementary angles.
Yes, adjacent angles are supplementary; however, opposite angles are not.
Adjacent angles in a parallelogram are supplementary.