In which diagram do angles 1 and 2 form a linear pair?

To determine in which diagram angles 1 and 2 form a linear pair, we need to understand the concept of a linear pair of angles.

Step 1: Define the Problem

Identify the key components of the question:

• Understand what a linear pair of angles is.
• Determine the conditions under which two angles form a linear pair.

Step 2: Break Down the Problem

• A linear pair of angles is formed when two adjacent angles are supplementary, meaning their measures add up to $180^\circ$.
• The angles must be adjacent, sharing a common arm and vertex.

Step 3: Apply Relevant Concepts

• Look for diagrams where angles 1 and 2 are adjacent.
• Check if the sum of angles 1 and 2 equals $180^\circ$.

Step 4: Analysis, Verify and Summarize

• Examine each diagram to see if angles 1 and 2 are adjacent and supplementary.
• Verify if the conditions for a linear pair are met.

Final Answer

Without the specific diagrams, I can't determine which one shows angles 1 and 2 forming a linear pair. However, in any diagram where angles 1 and 2 are adjacent and their measures add up to $180^\circ$, they form a linear pair.