In the image, you are asked to identify the angle relationship between angles marked as 1 and 2.

The diagram shows two parallel lines with a transversal (the red diagonal line) crossing them. The angles on opposite sides of the transversal but inside the two parallel lines are alternate interior angles.

Hence, the correct answer is:

• Alternate Interior Angles.

Would you like any further clarification, or would you like me to go into more detail?

Here are 5 related questions:

1. What are corresponding angles in a transversal?
2. How do alternate exterior angles differ from alternate interior angles?
3. What are consecutive interior angles, and when are they supplementary?
4. How can we prove two lines are parallel using angle relationships?
5. What other types of angles can be formed when a transversal crosses two lines?

Tip: Alternate interior angles are always congruent when the two lines are parallel.