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1. Oxford American Dictionary

   complementary angle

   • IPA[ˌkämpləˌmen(t)ərē ˈaNGɡəl]

   美式

   • n.
     either of two angles whose sum is 90°.

   • noun: complementary angle, plural noun: complementary angles

2. • 更多解釋

   complementary angle

   英式

   • n.
     either of two angles whose sum is 90°.

   Oxford Dictionary