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complementary angles

American  
[kahm-pluh-men-tuh-ree ang-guhlz] / ˌkɑm pləˈmɛn tə ri ˈæŋ gəlz /

plural noun

  1. Geometry. a pair of angles whose sum is 90°.


complementary angles Scientific  
/ kŏm′plə-mĕntə-rē /
  1. Two angles whose sum is 90°.


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