When the sum of two angles is equal to 180 degrees then they are supplementary angles, that form a linear angle together.
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Supplementary angles are the angles that sum up to 180 degrees. For example, angle 140° and angle 40° are supplementary angles because the sum of 140° and 30° is equal to 180°.
The same-side interior angle theorem states that when two lines that are parallel are intersected by a transversal line, then the same-side interior angles that are formed are supplementary, or add up to 180 degrees.
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