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Angles L and M are supplementary. What is the sum of their measures? The sum of the measures of angles L and M is

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Supplementary angles will always add up to 180. If you had a straight line, and you drew another line across that line, the two angles on either side of that line would add up to 180 because a flat line is equal to 180 degrees.
texaschic101
supplementary angles, when added, = 180 degrees

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