The two angles shown in the image are complementary angles.

Definition:

Complementary angles are two angles whose measures add up to 90 degrees. In your case, the angles $59^\circ$ and $31^\circ$ add up to exactly 90 degrees, making them complementary.

Would you like more details or have any questions about complementary angles?

Here are some related questions you might find interesting:

1. What is the difference between complementary and supplementary angles?
2. Can two obtuse angles be complementary?
3. How do you determine if two angles are complementary using a protractor?
4. What are some real-life examples of complementary angles?
5. How do complementary angles relate to right triangles?

Tip: In geometry, complementary angles are often found in right triangles, where the two non-right angles always add up to 90 degrees.