supplementary angle
noun [ C ] mathematics specialized uk/ˌsʌp.lɪ ˈmen.tər.i ˈæŋ.ɡəl/ us/ˌsʌp.lɪ ˈmen.t̬ɚ.i ˈæŋ.ɡəl/
补角
one of two angles that together add up to 180°
Compare: complementary angle
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