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Find the supplementary angle to an angle that is 128.9°. Explain your answer.
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Find the supplementary angle to an angle that is 128.9°. Explain your answer.

User Hareesh
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Supplementary angles are 180 degrees, so subtract 128.9 by 180. This should give you 51.1.
User Alex Khvatov
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Supplementary angles add up to 180°, thus the supplementary angle to 128.9° would be:
180 - 128.9 = 51.1°
User Myrian
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