It is 140 degrees because supplementary angles add up to 180 degrees
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140
the angle and its supplementary angle added together is 180 the supplementary angle of angle y is 180-y
40 + x = 180 180 - 40 = 140 supplementary angle = 140 degrees
A supplementary angle is a 180-degree angle minus the number of degrees in the given angle.
Supplementary angles add up to 180 degrees