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supplementary angles

American  
[suhp-luh-men-tuh-ree ang-guhlz] / ˌsʌp ləˈmɛn tə ri ˈæŋ gəlz /

plural noun

  1. Geometry. a pair of angles whose sum is 180°.


supplementary angles Scientific  
/ sŭp′lə-mĕntə-rē /
  1. Two angles whose sum is 180°.


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