Electrical mathQuestion 476 of 1506

Two angles add up to 90 degrees. What are they called?

  1. Supplementary angles
  2. Acute angles
  3. Similar angles
  4. Complementary angles
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Correct answer: Complementary angles

Supplementary angles add to 180 degrees.

Source: Trigonometry and Single Phase AC Generation for Electricians (Flinn), 1.1: Angles

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Questions last reviewed: 18 October 2026