Angles that add up to 180 degrees
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That's the definition of "supplementary angels".
2 angles are supplementary if they add up to 180 degrees
1.in a trapezium, only one pair of opposite sides are parallel. 2.in a trapezium, only one pair consecutive angels are supplementary.
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.