The question asks about the definition of complementary angles.

Answer: Two angles are complementary if they add up to 90 degrees.

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Related Questions:

1. What are supplementary angles, and how do they differ from complementary angles?
2. How can we determine if two given angles are complementary?
3. What happens if the sum of two angles is greater than or less than 90 degrees?
4. Can three angles be complementary? Why or why not?
5. How are complementary angles used in geometry problems involving right triangles?

Tip:

When working with complementary angles, remember that they always form a right angle when combined.