if a straight line stands on another straight line, the sum of measure of two angles so formed is equal to two right angles.
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Supplementary angles. line and makes the adjacent angles equal, then we have two right angles. But it should be obvious that when any straight line stands on another, then the adjacent angles ABC, ABD are together equal to two right angles. That is the next proposition.
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Supplementary angles
Two angles are called reciprocal when their measures add to 90 degrees. Two angles are called supplementary when their measures add up to 180degrees.Supplementary angles are those angles that add up to 180 degrees. For illustration, angle 130 ° and angle 50 ° are supplementary angles because sum of 130 ° and 50 ° is equal to 180 °.
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