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This diagram shows two parallel lines \( m \) and \( n \) cut by two transversals \( s \) and \( t \), forming several pairs of angles. The task is to determine the relationship between certain pairs of angles.

### Common angle relationships:
1. **Corresponding Angles**: Angles in matching corners when a transversal crosses two parallel lines (e.g., \( \angle 1 \) and \( \angle 5 \)).
2. **Alternate Interior Angles**: Angles on opposite sides of the transversal but inside the two parallel lines (e.g., \( \angle 3 \) and \( \angle 13 \)).
3. **Alternate Exterior Angles**: Angles on opposite sides of the transversal and outside the two parallel lines (e.g., \( \angle 1 \) and \( \angle 15 \)).
4. **Same-Side Interior (Consecutive Interior) Angles**: Angles on the same side of the transversal and inside the parallel lines (e.g., \( \angle 4 \) and \( \angle 12 \)).
5. **Vertical Angles**: Angles opposite each other when two lines cross (e.g., \( \angle 1 \) and \( \angle 4 \)).

Now, I'll analyze the angle pairs you are asked to identify:

### 1. \( \angle 7 \) and \( \angle 11 \)
- These angles are **alternate interior angles**, as they are on opposite sides of the transversal and inside the parallel lines \( m \) and \( n \).

### 2. \( \angle 2 \) and \( \angle 10 \)
- These angles are also **alternate interior angles**, for the same reasoning.

### 3. \( \angle 12 \) and \( \angle 14 \)
- These are **same-side interior angles** (consecutive interior), as they are on the same side of the transversal and inside the two parallel lines.

### 4. \( \angle 9 \) and \( \angle 11 \)
- These are **vertical angles**, as they are opposite each other at the intersection of two lines.

### 5. \( \angle 8 \) and \( \angle 14 \)
- These angles are **alternate exterior angles**, as they are on opposite sides of the transversal and outside the parallel lines.

### 6. \( \angle 8 \) and \( \angle 13 \)
- These are **corresponding angles**, because they are in the same relative position at the two intersections formed by the transversal and the parallel lines.

### 7. \( \angle 12 \) and \( \angle 6 \)
- These are **alternate exterior angles**, since they lie outside the parallel lines and on opposite sides of the transversal.

### 8. \( \angle 10 \) and \( \angle 11 \)
- These are **adjacent angles** (linear pair), as they form a straight line along the transversal.

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Would you like more details on any specific angle pair or a further explanation?

Here are 5 related questions to explore:
1. What are the properties of corresponding angles in parallel line systems?
2. How do alternate interior angles help prove lines are parallel?
3. Can consecutive interior angles be equal if lines are not parallel?
4. How do vertical angles relate to the concept of symmetry in geometry?
5. How do transversal lines interact with non-parallel lines?

**Tip:** Always look for vertical angles and corresponding angles first when analyzing parallel line diagrams!

Given the diagram above, determine how each given angle pair is related. Choose the option of the pair that best describes the relationship of the angles.

Determine the relationships between pairs of angles in a diagram with two parallel lines cut by two transversals. Learn about corresponding angles, alternate interior and exterior angles, vertical angles, and same-side interior angles. Suitable for students in Grades 8-10.

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