Any two supplementary angles will equal 180 degrees when added.
Examples:
90+90
60+120
1+179
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Angles that add to 180 degrees are called supplementary angles, while angles that add to 90 degrees are called complentary angles.
Two angles that share a common side and add up to 180 degrees are called right angles and are 90 degrees.
Two supplementary angles add up to 180 degrees
They are called linear pair, because their farthest sides lie on the same line.Any two angles that add to 180 degrees are called supplementary angles.
Two supplementary angles add up to 180 degrees.