Definition of supplementary angles
IF m<3+m<4=180, then <3 and <4 are supplementary angles.
Supplementary angles are two angles that have a sum of 180 degrees. In other words, when you add the measures of these two angles, the result is 180 degrees. Supplementary angles can be adjacent (share a common side and vertex) or non-adjacent. Any two angles that sum up to 180 degrees are supplementary angles. For example, angles measuring 60 degrees and 120 degrees are supplementary angles, as are angles measuring 40 degrees and 140 degrees.
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