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The measure of an angle is 121.9°. What is the measure of its supplementary angle?
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The measure of an angle is 121.9°. What is the measure of its supplementary angle?

User Vytas
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Supplementary angles add up to 180°, so subtract 121.9° from 180°:

180° - 121.9° = 58.1°
User Asdasd
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