The image shows two adjacent angles, one measuring 60° and the other measuring 30°. These angles together form a right angle, as their sum is:

$60^\circ + 30^\circ = 90^\circ$

When two angles add up to 90°, they are called complementary angles.

Thus, the correct answer to this question is:

• complementary angles

Would you like further details or clarification on complementary angles or any other terms?

Related Questions:

1. What are supplementary angles, and how do they differ from complementary angles?
2. Can two angles that are not adjacent be complementary?
3. What are vertical angles, and how are they formed?
4. What happens if two angles add up to more than 90° but less than 180°?
5. Can complementary angles ever be equal?

Tip: Complementary angles don't always have to be adjacent (next to each other); they just need to sum to 90°.