Find the measure of the supplementary angle pair of 138 $^{o}$ . (in degrees)

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Solution

Supplementary angles are two angles with a sum of $180^{o} .$
Measure of one supplementary angle is $138^{o} .$
$\Rightarrow$ Measure of other supplementary angle $= 180^{o} - 138^{o}$
$= 42^{o} .$

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